Adding tracing + attributes to all resolvers

[willvedd]

Description

Improving observability of the check resolution process by adding tracing and an appropriate set of attributes for each resolver. Previously, only the local check resolver had tracing but now that we have three separate resolvers, it makes sense to observe those too.

Admittedly, the resolver_type attribute is not a best practice and should have been accomplished by the built-in package attribute but that would have required a messy refactor.

Demo:
Note: traces show that nested resolver delegation doesn't work as intended. Behavior currently depends if cached is enabled or not. This will be fixed in future PR. These are just to prove that traces are working.

Cache disabled:

Cache enabled:

References

• SingleflightCheckResolver #1313
• feat: add CachedCheckResolver for caching Check subproblems #891

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]

Codecov Report

Attention: 1 lines in your changes are missing coverage. Please review.

Comparison is base (60f457e) 0.00% compared to head (7655730) 83.83%.

Files	Patch %	Lines
internal/graph/cached_resolver.go	88.89%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff            @@
##           main    #1331       +/-   ##
=========================================
+ Coverage      0   83.83%   +83.83%     
=========================================
  Files         0       85       +85     
  Lines         0     9850     +9850     
=========================================
+ Hits          0     8257     +8257     
- Misses        0     1239     +1239     
- Partials      0      354      +354     

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