fix: OpenFGA SDK doesn't seem to support async_req parameter

[Abishek-Newar]

Description

What problem is being solved?

The async_req parameter exists in the lower-level api_client.py to enable threading-based asynchronous requests using Python's ThreadPool. However, this parameter is not exposed through the public OpenFgaClient API because the options_to_kwargs function doesn't support it, making it inaccessible without using internal APIs.

How is it being solved?

Updated the options_to_kwargs function to pass through the async_req parameter from user options to the underlying API calls.

What changes are made to solve it?

• Added async_req parameter support in openfga_sdk/sync/client/client.py (sync client)

After this change, users can use async_req like this:

result = client.list_stores(options={"async_req": True})

References

closes #194

Review Checklist

• I have clicked on "allow edits by maintainers".
• I have added documentation for new/changed functionality in this PR or in a PR to openfga.dev
• The correct base branch is being used, if not main
• I have added tests to validate that the change in functionality is working as expected

Summary by CodeRabbit

• New Features
  • Added support for asynchronous request handling in API client operations. Users can now pass async request preferences through configuration options to enable non-blocking API calls.

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