otelconf: add support for propagator configuration

[codeboten]

Fixes #6712

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 82.3%. Comparing base (0948681) to head (5eed12c).

Additional details and impacted files

@@          Coverage Diff          @@
##            main   #8281   +/-   ##
=====================================
  Coverage   82.3%   82.3%           
=====================================
  Files        184     185    +1     
  Lines      13768   13803   +35     
=====================================
+ Hits       11333   11368   +35     
  Misses      2030    2030           
  Partials     405     405           

Files with missing lines	Coverage Δ
otelconf/config.go	97.8% <100.0%> (+0.1%)	⬆️
otelconf/propagator.go	100.0% <100.0%> (ø)

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