feat: update opentelemetry hook to latest version of semantic conventions

[federicobond]

This PR

Updates the OTel hook to support the latest version of semantic conventions published at:
https://opentelemetry.io/docs/specs/semconv/registry/attributes/feature-flag/

[gemini-code-assist]

Summary of Changes

Hello @federicobond, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request upgrades the OpenTelemetry hook to adhere to the most recent OpenTelemetry semantic conventions for feature flags. The primary goal is to enrich the tracing data generated during feature flag evaluations by incorporating more detailed attributes, thereby improving observability and troubleshooting capabilities. This involves adding a new dependency and refactoring the event attribute structure.

Highlights

• Dependency Update: Added opentelemetry-semantic-conventions as a new dependency to align with the latest OpenTelemetry specifications.
• Semantic Convention Alignment: Updated the OpenTelemetry hook to use the latest semantic conventions for feature flag evaluation, including new event names and attribute keys.
• Enhanced Tracing Details: Expanded the data captured during flag evaluations to include more granular details such as result value, reason, variant, context ID, and comprehensive error information.
• Test Coverage: Updated existing tests and added a new test case to validate the correct logging of detailed event attributes, especially for error scenarios.

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[gemini-code-assist]

Code Review

This pull request updates the OpenTelemetry hook to align with the latest semantic conventions, which is a valuable improvement. The changes are well-implemented, and the tests have been updated accordingly to cover the new logic. I have a couple of suggestions to enhance dependency management and improve code clarity.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 95.04%. Comparing base (97a5717) to head (01fae9c).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #326      +/-   ##
==========================================
+ Coverage   94.56%   95.04%   +0.47%     
==========================================
  Files          22       22              
  Lines        1068     1090      +22     
==========================================
+ Hits         1010     1036      +26     
+ Misses         58       54       -4     

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[federicobond]

Test failures are related to open-feature/python-sdk#552. We can work around that or require a version with that fix.

[federicobond]

@gruebel there are some build failures related to protobuf in the openfeature-provider-flagd build. It looks like it might not be pulling in the latest version of protobuf.

I cannot reproduce it in my own machine though, despite running the same uv sync --frozen. Do you know anything about it?

Edit: fix is now in main