Fork in persistent storage implementation to otlp

[vishweshbankwar]

Towards #4791
Design discussion issue #

Changes

This PR forks in OpenTelemetry.PersistentStorage.Abstractions and OpenTelemetry.PersistentStorage.FileSystem into the otlp exporter package. The APIs from this package will be used for adding retry support via persistent storage.

The code is copied as is. It defines new constant for enabling as is copy <DefineConstants>BUILDING_INTERNAL_PERSISTENT_STORAGE</DefineConstants>

Reference PR open-telemetry/opentelemetry-dotnet-contrib#1320

Merge requirement checklist

• CONTRIBUTING guidelines followed (nullable enabled, static analysis, etc.)
• Unit tests added/updated
• Appropriate CHANGELOG.md files updated for non-trivial changes
• Changes in public API reviewed (if applicable)

[codecov]

Codecov Report

Merging #4793 (990fddb) into main (e330e57) will decrease coverage by 2.16%.
Report is 1 commits behind head on main.
The diff coverage is 0.00%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4793      +/-   ##
==========================================
- Coverage   85.59%   83.44%   -2.16%     
==========================================
  Files         284      292       +8     
  Lines       11686    11987     +301     
==========================================
- Hits        10003    10002       -1     
- Misses       1683     1985     +302     

Files Changed	Coverage Δ
...Protocol/PersistentStorage/DirectorySizeTracker.cs	0.00% <0.00%> (ø)
...penTelemetryProtocol/PersistentStorage/FileBlob.cs	0.00% <0.00%> (ø)
...etryProtocol/PersistentStorage/FileBlobProvider.cs	0.00% <0.00%> (ø)
...emetryProtocol/PersistentStorage/PersistentBlob.cs	0.00% <0.00%> (ø)
...otocol/PersistentStorage/PersistentBlobProvider.cs	0.00% <0.00%> (ø)
...torage/PersistentStorageAbstractionsEventSource.cs	0.00% <0.00%> (ø)
.../PersistentStorage/PersistentStorageEventSource.cs	0.00% <0.00%> (ø)
...tocol/PersistentStorage/PersistentStorageHelper.cs	0.00% <0.00%> (ø)

... and 3 files with indirect coverage changes

[alanwest]

I assume PersistentStorage will continue to be maintained in the contrib repo. If so I would expect PRs like this to be easy reviews with no alterations to the code (alterations should be done in the contrib repo) other than marking things internal, of course.

Lifting this code into the main repo is a fine strategy in the interim, though I think we need a little documentation for how we aim to maintain this lifted code. A README in the PersistentStorage directory would suffice - with links to the real source and a simple outline of steps for keeping it up to date if necessary.

[vishweshbankwar]

I assume PersistentStorage will continue to be maintained in the contrib repo. If so I would expect PRs like this to be easy reviews with no alterations to the code (alterations should be done in the contrib repo) other than marking things internal, of course.

Lifting this code into the main repo is a fine strategy in the interim, though I think we need a little documentation for how we aim to maintain this lifted code. A README in the PersistentStorage directory would suffice - with links to the real source and a simple outline of steps for keeping it up to date if necessary.

👍 Added Readme.