fix: update client interface with store and model getter/setter

[ewanharris]

Description

Adds the getter/setter methods for Authorization Model ID and Store ID onto the SdkClient interface so that when generating a mock from this client they can be used.

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

All modified and coverable lines are covered by tests ✅

Project coverage is 25.98%. Comparing base (3768fc2) to head (929fc88).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #155   +/-   ##
=======================================
  Coverage   25.98%   25.98%           
=======================================
  Files         102      102           
  Lines       12405    12405           
=======================================
  Hits         3223     3223           
  Misses       8911     8911           
  Partials      271      271           

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