Allow running conjure-python-client on Windows

[schmelczer]

Before this PR

TCP_KEEPINTVL and TCP_KEEPIDLE are not available in every Python build on Windows. Previously, TCP_KEEPINTVL was used unconditionally (crashing on Windows) and TCP_KEEPIDLE was only gated for macOS (also crashing on Windows.

See https://github.com/python/cpython/blob/b32c830d444c85421bd2c0c7af494c9d85485a29/Modules/socketmodule.c#L337-L340 which shows it's available from api version 16299.

Notably, the conda-forge builds of Python use a lower api version, I think it's because of their old Windows image (https://github.com/conda-forge/python-feedstock/blob/02184ce041a6bfa67e45fb2472a587ef13a99669/.azure-pipelines/azure-pipelines-win.yml#L8) but I'm not entirely sure.

After this PR

==COMMIT_MSG==
Allow running conjure-python-client on Windows
==COMMIT_MSG==

Only try accessing the properties if they're available.

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Allow running conjure-python-client on Windows

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🐛 Fixes

• Allow running conjure-python-client on Windows (#177)

[schmelczer]

this was unused

[psyclaudeZ]

The change LGTM, but I think the test is inconsistent now and we should probably patch it up.

conjure-python-client/test/_http/test_requests_client.py

Lines 5 to 10 in 512aadf

	from conjure_python_client._http.requests_client import (
	ConjureHTTPError,
	SOCKET_KEEP_ALIVE,
	SOCKET_KEEP_INTVL,
	TransportAdapter,
	)

and

conjure-python-client/test/_http/test_requests_client.py

Lines 30 to 31 in 512aadf

	assert SOCKET_KEEP_ALIVE in socket_options
	assert SOCKET_KEEP_INTVL in socket_options

Maybe use the same hasattr checks?