ObservabilityPolicy Enhancement Proposal

[sjberman]

Problem: We want a design for Observability-related configuration settings, such as tracing, to be applied at the HTTPRoute level.

Solution: Add enhancement proposal introducing ObservabilityPolicy.

Closes #1662

Checklist

Before creating a PR, run through this checklist and mark each as complete.

• I have read the CONTRIBUTING doc
• I have added tests that prove my fix is effective or that my feature works
• I have checked that all unit tests pass after adding my changes
• I have updated necessary documentation
• I have rebased my branch onto main
• I will ensure my PR is targeting the main branch and pulling from my branch from my own fork

Release notes

If this PR introduces a change that affects users and needs to be mentioned in the release notes,
please add a brief note that summarizes the change.

NONE

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 86.18%. Comparing base (2277050) to head (14457ff).

❗ Current head 14457ff differs from pull request most recent head 05e8c7a. Consider uploading reports for the commit 05e8c7a to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1795      +/-   ##
==========================================
- Coverage   86.20%   86.18%   -0.03%     
==========================================
  Files          83       87       +4     
  Lines        5540     5522      -18     
  Branches       52       52              
==========================================
- Hits         4776     4759      -17     
- Misses        715      717       +2     
+ Partials       49       46       -3     

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