Fix memory exhaustion when downloading large files (#869)

## Description
This PR fixes issue #754 where the Kaggle API would exhaust system
memory when downloading large datasets.
### Problem
The HTTP client was not using `stream=True` when making requests for
file downloads. This caused the entire file content to be loaded into
memory before being written to disk, making the system unstable when
downloading large datasets.
### Solution  
- Modified `KaggleHttpClient.call()` to detect file download response
types (`FileDownload` and `HttpRedirect`)
- Automatically enable streaming (`stream=True`) for these response
types
- The existing `download_file()` method already uses
`response.iter_content()` for chunked reading, which now works properly
with streaming enabled
### Changes
- **src/kagglesdk/kaggle_http_client.py**
  - Added imports for `FileDownload` and `HttpRedirect` types
- Added logic to set `stream=True` in request settings for file
downloads
  
- **pyproject.toml**
  - Removed `kagglesdk` from dependencies list
- Reason: `kagglesdk` source code is in `src/kagglesdk/` and should use
local code during editable install, not pull from PyPI
### Impact
This fix improves memory usage for:
- Competition file downloads (`competition_download_file`,
`competition_download_files`)
- Dataset downloads (`dataset_download_file`, `dataset_download_files`)
- Model downloads (`model_instance_version_download`)
- Kernel output downloads (`kernels_output`)
- Leaderboard downloads (`competition_leaderboard_download`)
### Testing
- ✅ Tested CLI: `kaggle competitions list` works correctly
- ✅ Verified streaming is enabled for file download requests
- ✅ Backward compatible - no changes to public API
Fixes #754

Author: SiqiChen9

src/kagglesdk/kaggle_http_client.py

@@ -16,6 +16,8 @@
     KaggleEnv,
 )
 from kagglesdk.kaggle_object import KaggleObject
+from kagglesdk.common.types.file_download import FileDownload
+from kagglesdk.common.types.http_redirect import HttpRedirect
 from typing import Type
 
 # TODO (http://b/354237483) Generate the client from the existing one.
@@ -81,6 +83,12 @@ def call(
 
         # Merge environment settings into session
         settings = self._session.merge_environment_settings(http_request.url, {}, None, None, None)
+        
+        # Use stream=True for file downloads to avoid loading entire file into memory
+        # See: https://github.com/Kaggle/kaggle-api/issues/754
+        if response_type is not None and (response_type == FileDownload or response_type == HttpRedirect):
+            settings['stream'] = True
+        
         http_response = self._session.send(http_request, **settings)
 
         response = self._prepare_response(response_type, http_response)