[python] api client type checks

[artem-ilin]

Fixes #21936

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Steps to verify:

git clone [email protected]:artem-ilin/openapi-generator.git
git checkout fix-python-type-checks
cd openapi-generator/samples/client/echo_api/python
docker run -v .:/io --rm ghcr.io/astral-sh/ruff check --fix

output:

Found 55 errors (55 fixed, 0 remaining).

output before fix (from master branch):

warning: Invalid rule code provided to `# noqa` at setup.py:16: H301
E721 Use `is` and `is not` for type comparisons, or `isinstance()` for isinstance checks
   --> openapi_client/api_client.py:459:14
    |
457 |         if klass in self.PRIMITIVE_TYPES:
458 |             return self.__deserialize_primitive(data, klass)
459 |         elif klass == object:
    |              ^^^^^^^^^^^^^^^
460 |             return self.__deserialize_object(data)
461 |         elif klass == datetime.date:
    |

Found 56 errors (55 fixed, 1 remaining).

[artem-ilin]

Python committee @cbornet @tomplus @krjakbrjak @fa0311 @multani @wing328 please take a look.
The same issue actually persists in python-pydantic-v1 generator, but I decided not to touch it in this PR.

[wing328]

thanks for the PR. please review the test failure when you've time.

[artem-ilin]

@wing328 thank you! I updated the PR, please review.

[wing328]

all tests passed

if no one has further feedback, i'll merge it this weekend.

thanks for the contribution

[multani]

lgtm