[RFC] Simplifying stateful behavior

[VihasMakwana]

Description

This PR adds a new RFC to simplify enabling statefulness. It is a part of open-telemetry/opentelemetry-collector-contrib#35013.

An open question to folks is:

Which directory to use for storing offsets if the feature gate is enabled?

Link to tracking issue

Relates open-telemetry/opentelemetry-collector-contrib#35013

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 91.53%. Comparing base (8d71881) to head (4f69126).

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #13224      +/-   ##
==========================================
+ Coverage   91.51%   91.53%   +0.01%     
==========================================
  Files         522      522              
  Lines       28988    28988              
==========================================
+ Hits        26529    26533       +4     
+ Misses       1939     1936       -3     
+ Partials      520      519       -1     

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[VihasMakwana]

@mx-psi @dmitryax @bogdandrutu @codeboten I'll announce this RFC in today's SIG.
I suppose most of you wouldn't join due to timezone differences. I'd love to hear your thoughts.

I'll try my best to join next iteration of SIG i.e. the one occurring at 9:00 PT.