[chore] Create RFC for Optional config types

[evan-bradley]

Description

This RFC will help us explore the use cases Optional types solve and move us toward a resolution for whether to adopt these in our config.

Related to #10266

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 91.55%. Comparing base (bac08e2) to head (939fa0b).
Report is 1 commits behind head on main.

Additional details and impacted files

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##             main   #12596   +/-   ##
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  Coverage   91.55%   91.55%           
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  Files         499      499           
  Lines       27102    27102           
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  Hits        24814    24814           
  Misses       1809     1809           
  Partials      479      479           

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[evan-bradley]

@yurishkuro could you take a look at this? We're taking a closer look at whether we want this type for 1.0 and want to make sure if we add it that it will cover all config use cases and won't have any major downsides. I would appreciate your input here.

[yurishkuro]

+1

[bogdandrutu]

I think we can then remove https://github.com/open-telemetry/opentelemetry-collector/blob/main/confmap/confmap.go#L351

[github-actions]

This PR was marked stale due to lack of activity. It will be closed in 14 days.

[mx-psi]

cc @open-telemetry/collector-approvers This has entered final comment period, I intend to merge this on Friday if there are no further blocking comments

[mx-psi]

I believe none of the pending conversations are blocking, but I pinged the authors just in case.