feat(instrumentation): make InstrumentationAbstract.init public

[drewcorlin1]

Which problem is this PR solving?

For the esbuild instrumentation plugin I'm attempting to rely on .init() at build time to get info about instrumentations, and in order for that to typecheck I need public access to this method.

Fixes # (issue)

Short description of the changes

Type of change

Please delete options that are not relevant.

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

How Has This Been Tested?

Compile this package and use it in that plugin (locally).
In this repo:

• npm run compile
• cd experimental/packages/opentelemetry-instrumentation
• npm pack

In my fork of the opentelemetry-js-contrib on the esbuild-plugin branch (which is in the same directory as opentelemetry-js)

• cd packages/esbuild-plugin-node
• npm i ../../../opentelemetry-js/experimental/packages/opentelemetry-instrumentation-grpc/opentelemetry-instrumentation-0.47.0.tgz

Checklist:

• Followed the style guidelines of this project
• Unit tests have been added
• Documentation has been updated

[codecov]

Codecov Report

Merging #4418 (653d25d) into main (2df6310) will decrease coverage by 1.56%.
The diff coverage is n/a.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4418      +/-   ##
==========================================
- Coverage   92.37%   90.81%   -1.56%     
==========================================
  Files         304       87     -217     
  Lines        8682     1906    -6776     
  Branches     1831      405    -1426     
==========================================
- Hits         8020     1731    -6289     
+ Misses        662      175     -487     

see 219 files with indirect coverage changes

[dyladan]

Change from protected to public is technically expanding the API surface, but only minimally. I'm fine with it if the other maintainers are.

[pichlermarc]

I'm also okay with this change. 👍
Just one comment about the documentation of init()

[pichlermarc]

Looks good, thanks for updating the JSdoc 🙂

[drewcorlin1]

@pichlermarc could you merge when you get a moment? thanks!