Support passing a template ID to createPod (#145)

[tleyden]

This fixes #145 and #123 by add an optional template_id parameter to createPod()

I re-ran the unit tests locally via pytest, and everything is passing:

pytest
==================================================================================== test session starts =====================================================================================
platform darwin -- Python 3.11.5, pytest-7.4.2, pluggy-1.3.0
rootdir: /Users/tleyden/Development/runpod-python
plugins: anyio-3.7.1
collected 129 items                                                                                                                                                                          

tests/test_whatever.py ...                                                                                                                                                             [  2%]
tests/test_api/test_ctl_commands.py .........                                                                                                                                          [  9%]
tests/test_api/test_mutations_pods.py ....                                                                                                                                             [ 12%]
tests/test_cli/test_commands.py ..                                                                                                                                                     [ 13%]
tests/test_cli/test_config.py ....                                                                                                                                                     [ 17%]
tests/test_endpoint/test_asyncio_runner.py ......                                                                                                                                      [ 21%]
tests/test_endpoint/test_runner.py .........                                                                                                                                           [ 28%]
tests/test_serverless/test_worker.py ..............                                                                                                                                    [ 39%]
tests/test_serverless/test_modules/test_fastapi.py ..                                                                                                                                  [ 41%]
tests/test_serverless/test_modules/test_http.py ....                                                                                                                                   [ 44%]
tests/test_serverless/test_modules/test_job.py ...............                                                                                                                         [ 55%]
tests/test_serverless/test_modules/test_local.py .....                                                                                                                                 [ 59%]
tests/test_serverless/test_modules/test_logger.py ........                                                                                                                             [ 65%]
tests/test_serverless/test_modules/test_ping.py ..                                                                                                                                     [ 67%]
tests/test_serverless/test_modules/test_progress.py .                                                                                                                                  [ 68%]
tests/test_serverless/test_modules/test_state.py .......                                                                                                                               [ 73%]
tests/test_serverless/test_modules/test_tips.py ..                                                                                                                                     [ 75%]
tests/test_serverless/test_utils/test_cleanup.py ...                                                                                                                                   [ 77%]
tests/test_serverless/test_utils/test_cuda.py ...                                                                                                                                      [ 79%]
tests/test_serverless/test_utils/test_debugger.py .......                                                                                                                              [ 85%]
tests/test_serverless/test_utils/test_download.py .....                                                                                                                                [ 89%]
tests/test_serverless/test_utils/test_upload.py ......                                                                                                                                 [ 93%]
tests/test_serverless/test_utils/test_validate.py .......                                                                                                                              [ 99%]
tests/test_shared/test_auth.py .                                                                                                                                                       [100%]

====================================================================================== warnings summary ======================================================================================
runpod/__init__.py:3
  /Users/tleyden/Development/runpod-python/runpod/__init__.py:3: DeprecationWarning: pkg_resources is deprecated as an API. See https://setuptools.pypa.io/en/latest/pkg_resources.html
    from pkg_resources import get_distribution, DistributionNotFound

tests/test_serverless/test_modules/test_fastapi.py:49
  /Users/tleyden/Development/runpod-python/tests/test_serverless/test_modules/test_fastapi.py:49: PytestUnknownMarkWarning: Unknown pytest.mark.asyncio - is this a typo?  You can register custom marks to avoid this warning - for details, see https://docs.pytest.org/en/stable/how-to/mark.html
    @pytest.mark.asyncio

-- Docs: https://docs.pytest.org/en/stable/how-to/capture-warnings.html
============================================================================== 129 passed, 2 warnings in 49.92s ==============================================================================