fix: api client should set default telemetry if not specified

[jimmyjames]

Ensure that a default telemetry instance is created when creating an API client directly.

Description

When a Configuration is created via NewConfiguration, we ensure that a default telemetry is created if not specified. However, when creating a Configuration directly as shown in #466, no telemetry is created. This causes telemetry.Get to create a new telemetry instance on each call (e.g., each API call), which causes the map to grow unbounded.

This change ensures that a default Telemetry instance is created when creating a new APIClient.

References

openfga/sdk-generator#466

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 25.70%. Comparing base (9b6f886) to head (ac935fb).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #160      +/-   ##
==========================================
+ Coverage   25.68%   25.70%   +0.01%     
==========================================
  Files         104      104              
  Lines       12577    12580       +3     
==========================================
+ Hits         3231     3234       +3     
  Misses       9075     9075              
  Partials      271      271              

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