feat!: support server-side batch check endpoint

[piotrooo]

Description

References

closes #127
openfga/sdk-generator#475

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 85.45455% with 24 lines in your changes missing coverage. Please review.

Project coverage is 32.78%. Comparing base (c249fb6) to head (6e9777a).

Files with missing lines	Patch %	Lines
...i/client/model/ClientBatchCheckClientResponse.java	59.25%	9 Missing and 2 partials ⚠️
...java/dev/openfga/sdk/api/client/OpenFgaClient.java	89.18%	4 Missing and 4 partials ⚠️
...fga/sdk/api/client/model/ClientBatchCheckItem.java	89.47%	2 Missing ⚠️
...i/configuration/ClientBatchCheckClientOptions.java	88.23%	2 Missing ⚠️
.../sdk/api/client/model/ClientBatchCheckRequest.java	80.00%	1 Missing ⚠️

❌ Your project status has failed because the head coverage (32.78%) is below the target coverage (80.00%). You can increase the head coverage or adjust the target coverage.

Additional details and impacted files

@@             Coverage Diff              @@
##               main     #141      +/-   ##
============================================
+ Coverage     29.82%   32.78%   +2.96%     
- Complexity      890      973      +83     
============================================
  Files           176      182       +6     
  Lines          6746     6872     +126     
  Branches        756      764       +8     
============================================
+ Hits           2012     2253     +241     
+ Misses         4632     4512     -120     
- Partials        102      107       +5     

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[jimmyjames]

🎉