[carriers] add env carrier #4609
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pellared
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## Changes Adds supplementary guidance around the behaviors the SDKs should look to implement. * [x] Related issues [#4470](#4470) & #4484 * [x] Related [OTEP 0258](https://github.com/open-telemetry/opentelemetry-specification/blob/main/oteps/0258-env-context-baggage-carriers.md) * [x] Links to the prototypes (when adding or changing features) - [Go](open-telemetry/opentelemetry-go#6778) - [Python](open-telemetry/opentelemetry-python#4609) * [x] [`CHANGELOG.md`](https://github.com/open-telemetry/opentelemetry-specification/blob/main/CHANGELOG.md) file updated for non-trivial changes --------- Co-authored-by: Robert Pająk <pellared@hotmail.com> Co-authored-by: Liudmila Molkova <limolkova@microsoft.com> Co-authored-by: Reiley Yang <reyang@microsoft.com>
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Description
Adds a prototype for the environment variable carrier, specifically decorating Getter and Setter instead of creating a dedicated propagator. The comes from the conversations within the environment variable context propagation specification pull request.
There's a corresponding thread in Slack around this topic.
The example use of the Getter portion of this prototype can be found in this gist.
Type of change
Please delete options that are not relevant.
How Has This Been Tested?
The Getter was tested by using the prototype in a real environment. Unit tests need to be added after conversation around this prototype.
Does This PR Require a Contrib Repo Change?
Checklist: