[extension] Split extension/experimental/storage into a separate module

[mx-psi]

Description

Fixes #11022

[mx-psi]

@codeboten Should we rename to extension/storage? I remember with the internal/featuregates separation into a module using the same name was a concern, so I wonder if this is also something we should address here

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 92.22%. Comparing base (c4e527e) to head (492ab78).
Report is 4 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main   #11020   +/-   ##
=======================================
  Coverage   92.22%   92.22%           
=======================================
  Files         408      408           
  Lines       19126    19126           
=======================================
  Hits        17639    17639           
  Misses       1126     1126           
  Partials      361      361           

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[codeboten]

@codeboten Should we rename to extension/storage? I remember with the internal/featuregates separation into a module using the same name was a concern, so I wonder if this is also something we should address here

@mx-psi i seem to recall this was only a problem if a package the collector contrib repo depends on also depends on the internal package being created. If not it's not an issue i think, we can always prove this by merging the change as is, and updating contrib to see if it fails w/ the errors we were seeing w/ featuregates

[mx-psi]

Alright, I am going to try merging this then and if the make update-otel goes well

[mx-psi]

Need #11029 next