Move extension/storage to extension/experimental/storage

[JamesJHPark]

Description:
This PR is to move the experimental package extension/storage to extension/experimental/storage and follow the extension packages naming conventions.

Link to tracking Issue:
#4059

[codeboten]

Change looks good here, please make sure to update the contrib repo as well.

[bogdandrutu]

@codeboten @Aneurysm9 see comment in the issue, do we follow the same pattern for just interfaces?

[Aneurysm9]

@codeboten @Aneurysm9 see comment in the issue, do we follow the same pattern for just interfaces?

Which pattern? Having extension at the end of the name or having experimental in the path? I think they're probably both fine, but I could be convinced that the suffix might not be necessary.

[bogdandrutu]

Was referring to the suffix since it is not an extension itself

[JamesJHPark]

@bogdandrutu storageextension suffix has been removed to storage. Thank you.

[codecov]

Codecov Report

Merging #4082 (90bc8f7) into main (ebb0fbd) will increase coverage by 0.34%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main    #4082      +/-   ##
==========================================
+ Coverage   87.53%   87.87%   +0.34%     
==========================================
  Files         173      173              
  Lines       10211    10181      -30     
==========================================
+ Hits         8938     8947       +9     
+ Misses       1010      984      -26     
+ Partials      263      250      -13     

Impacted Files	Coverage Δ
consumer/consumererror/combine.go	75.67% <0.00%> (-6.15%)	⬇️
service/parserprovider/merge.go	84.21% <0.00%> (-0.79%)	⬇️
config/configtest/configtest.go	96.66% <0.00%> (-0.25%)	⬇️
receiver/scraperhelper/scrapercontroller.go	93.02% <0.00%> (-0.09%)	⬇️
receiver/scrapererror/scrapeerror.go	100.00% <0.00%> (ø)
service/internal/fanoutconsumer/logs.go	100.00% <0.00%> (ø)
service/internal/fanoutconsumer/traces.go	100.00% <0.00%> (ø)
service/internal/fanoutconsumer/metrics.go	100.00% <0.00%> (ø)
config/internal/configsource/manager.go	87.42% <0.00%> (+0.81%)	⬆️
service/internal/builder/receivers_builder.go	74.74% <0.00%> (+1.24%)	⬆️
... and 5 more

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update ebb0fbd...90bc8f7. Read the comment docs.

[alolita]

Hi @bogdandrutu can you please do a final review and merge? ty!

[bogdandrutu]

@JamesJHPark please make sure that the contrib is fixed if needed.