feat(telemetry): add fga-client.request.count metric for tracking HTT…

[emilic]

…P requests

Record a counter metric on every HTTP attempt in recordTelemetry(), alongside the existing request.duration and query.duration metrics. This enables users to track the total number of HTTP requests made by the SDK via OpenTelemetry.

Closes #282

Description

What problem is being solved?

How is it being solved?

What changes are made to solve it?

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

[linux-foundation-easycla]

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[codecov-commenter]

Codecov Report

❌ Patch coverage is 85.71429% with 4 lines in your changes missing coverage. Please review.
✅ Project coverage is 33.78%. Comparing base (7e50860) to head (373c600).

Files with missing lines	Patch %	Lines
telemetry/attributes.go	0.00%	4 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #285      +/-   ##
==========================================
+ Coverage   33.63%   33.78%   +0.14%     
==========================================
  Files         115      115              
  Lines        9831     9859      +28     
==========================================
+ Hits         3307     3331      +24     
- Misses       6260     6264       +4     
  Partials      264      264              

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