…metry#3038)

…0-refactor-http-logic

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…elemetry#3044)

* Add a more informative error message when parsing ENV headers

Also, rename the function to make it clear that this parsing is specific
to headers provided via ENV variables.

Fixes open-telemetry#2376

* Use parse_env_headers in metrics and logs as well

* Fix lint

* Fix mypy

…etry-python into 2990-refactor-http-logic

… into 2990-refactor-http-logic

black format

…open-telemetry#3070)

remove changelog entry

* add protoencoder for metric

* remove commented code

Fixes open-telemetry#3079

…3045)

…try#3106)

…der (open-telemetry#3113)