Rename ComposableTraceIdRatioBased to ComposableProbability

[anuraaga]

Rename the composible ratio sampler to match the new name in the spec

https://opentelemetry.io/docs/specs/otel/trace/sdk/#composableprobability

This doesn't touch the top-level, where TraceIdRatio has a new development spec to output deprecation warnings - I think this will need to be implemented when the spec is marked stable, though not sure.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 90.17%. Comparing base (18780a3) to head (0d77a1f).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##               main    #7786   +/-   ##
=========================================
  Coverage     90.17%   90.17%           
  Complexity     7189     7189           
=========================================
  Files           814      814           
  Lines         21730    21730           
  Branches       2129     2129           
=========================================
  Hits          19594    19594           
  Misses         1467     1467           
  Partials        669      669           

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[jack-berg]

This doesn't touch the top-level, where TraceIdRatio has a new development spec to output deprecation warnings - I think this will need to be implemented when the spec is marked stable, though not sure.

Yeah let's handle that separately. Need to think through what "in development" means in terms of warnings. Can we really recommend upgrading to unstable ProbabilitySampler?

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