feat: report a per call http metric

[SoulPancake]

Description

Adds #118

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

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[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 38.04%. Comparing base (9d2fde1) to head (3ce00d5).

Additional details and impacted files

@@             Coverage Diff              @@
##               main     #310      +/-   ##
============================================
+ Coverage     38.02%   38.04%   +0.02%     
- Complexity     1257     1258       +1     
============================================
  Files           198      198              
  Lines          7643     7646       +3     
  Branches        885      885              
============================================
+ Hits           2906     2909       +3     
  Misses         4598     4598              
  Partials        139      139              

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