feat: add support for specifying consistency parameter

[rhamzeh]

Adds support for specifying the consistency parameter.

Description

Supports the ability to specify the consistency parameter for those endpoints that accept it (read, check, list users, list objects, and expand).

Note that a change to JsonStringEnumMemberConverter is also required to support the new enum UNSPECIFIED along with its EnumMember value (also UNSPECIFIED). Otherwise, there are errors when attempting to add the same key twice to the dictionary.

In addition to the included unit tests, manual testing was also done using the example application to verify that the enum changes work as expected, and that the consistency parameter is being sent.

References

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 [Provide a link to any relevant PRs in the references section above]
• 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

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 47.69231% with 34 lines in your changes missing coverage. Please review.

Project coverage is 31.15%. Comparing base (5e08694) to head (fe663b4).

Files	Patch %	Lines
src/OpenFga.Sdk/Model/CheckRequest.cs	12.50%	7 Missing ⚠️
src/OpenFga.Sdk/Model/ListObjectsRequest.cs	12.50%	7 Missing ⚠️
src/OpenFga.Sdk/Model/ListUsersRequest.cs	12.50%	7 Missing ⚠️
src/OpenFga.Sdk/Model/ReadRequest.cs	12.50%	7 Missing ⚠️
src/OpenFga.Sdk/Model/ExpandRequest.cs	37.50%	5 Missing ⚠️
...OpenFga.Sdk/Model/JsonStringEnumMemberConverter.cs	0.00%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #70      +/-   ##
==========================================
+ Coverage   30.96%   31.15%   +0.19%     
==========================================
  Files         119      122       +3     
  Lines        6030     6083      +53     
  Branches      784      785       +1     
==========================================
+ Hits         1867     1895      +28     
- Misses       4007     4030      +23     
- Partials      156      158       +2     

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[ewanharris]

Looks good to me, I'd also suggest @rhamzeh takes a look as he's more familiar with the SDK/the issue with the unspecified enum

[rhamzeh]

I can't approve my own PR, but ✅ from me. Thanks @jimmyjames!