Do not attempt to enumerate or normalize entries from carrier

[jack-berg]

open-telemetry/opentelemetry-specification#5144

• keys now only returns entries from the carrier that are already normalized
• get normalizes the requested key, and tries to fetch it as is from the carrier, but does not attempt to enumerate / normalize any entries in the carrier
• set normalizes entries before adding to carrier

cc @pellared - I think this is the intent of the spec PR

[pellared]

This is correct. Just the tests need to be updated 😉

[codecov]

Codecov Report

❌ Patch coverage is 93.33333% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 78.54%. Comparing base (327f564) to head (e796c9f).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
...y/api/incubator/propagation/EnvironmentSetter.java	91.66%	0 Missing and 1 partial ⚠️

❌ Your project check has failed because the head coverage (78.24%) is below the target coverage (89.00%). You can increase the head coverage or adjust the target coverage.

Additional details and impacted files

@@              Coverage Diff              @@
##               main    #8474       +/-   ##
=============================================
- Coverage     91.04%   78.54%   -12.50%     
- Complexity     7822     8474      +652     
=============================================
  Files           893     1008      +115     
  Lines         23721    28830     +5109     
  Branches       2364     3570     +1206     
=============================================
+ Hits          21596    22645     +1049     
- Misses         1407     5341     +3934     
- Partials        718      844      +126     

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