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 91.04%. Comparing base (327f564) to head (48a1f0a).

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

Additional details and impacted files

@@            Coverage Diff            @@
##               main    #8474   +/-   ##
=========================================
  Coverage     91.04%   91.04%           
- Complexity     7822     7828    +6     
=========================================
  Files           893      893           
  Lines         23721    23727    +6     
  Branches       2364     2365    +1     
=========================================
+ Hits          21596    21602    +6     
+ Misses         1407     1406    -1     
- Partials        718      719    +1     

☔ View full report in Codecov by Harness.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.

[jaydeluca]

I think this could be reworded to sound a bit more like a predicate

Suggested change

	/**
	* Determine if a key is a valid normalized environment variable name.
	*
	* <ul>
	* <li>ASCII letters are converted to uppercase
	* <li>Any character that is not an ASCII letter, digit, or underscore is replaced with an
	* underscore (including {@code .}, {@code -}, whitespace, and control characters)
	* <li>Does not start with a digit
	* </ul>
	*/
	/**
	* Determine if a key is a valid normalized environment variable name. Returns {@code true} if
	* {@code key} is non-empty, contains only uppercase ASCII letters, digits, and underscores, and
	* does not start with a digit.
	*/