feat(koa): Adds support to ignore a span by its layer name

[MrFabio]

Which problem is this PR solving?

• Adds ignoreLayersName option to instrumentation constructor config to allow layers to be ignored by its name.
• Currently we have the ignoreLayersType config, this new one will run after this check.
• It is useful if we want to ignore some layers like logger, allowedMethods, and some ones with no name. It also helps with reducing the number of spans.

Short description of the changes

• Defines KoaInstrumentationConfig with ignoreLayersName which is an array of string (layer names):
• Utils module with isLayerNameIgnored to check if a layer should be ignored by the name
• Modifies _patchLayer to check if the layer is ignored by the config

[linux-foundation-easycla]

The committers listed above are authorized under a signed CLA.

• ✅ login: MrFabio / name: Fábio Gomes (ab45188)

[codecov]

Codecov Report

Attention: Patch coverage is 96.29630% with 1 line in your changes missing coverage. Please review.

Project coverage is 89.78%. Comparing base (85f6398) to head (ab45188).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
...lemetry-instrumentation-koa/src/instrumentation.ts	75.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2028      +/-   ##
==========================================
+ Coverage   89.71%   89.78%   +0.06%     
==========================================
  Files         187      187              
  Lines        9097     9120      +23     
  Branches     1879     1886       +7     
==========================================
+ Hits         8161     8188      +27     
+ Misses        936      932       -4     

Files with missing lines	Coverage Δ
...ode/opentelemetry-instrumentation-koa/src/types.ts	100.00% <ø> (ø)
...ode/opentelemetry-instrumentation-koa/src/utils.ts	100.00% <100.00%> (ø)
...lemetry-instrumentation-koa/src/instrumentation.ts	94.11% <75.00%> (-1.07%)	⬇️

... and 2 files with indirect coverage changes

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[pichlermarc]

@trentm - I saw you reviewed this PR before - however this PR is targeting an unmaintained component. Are you sponsoring this feature? 🤔 If yes, please apply the has:sponsor label.

[pichlermarc]

Thanks for your continued effort in keeping this PR up to date. That said, it’s been open for quite a while without much engagement from reviewers or clear interest from end-users. To help keep the project maintainable and avoid long-lived PRs on unmaintained components, I’m going to close this PR.

We're happy to revisit this feature once a new owner for @opentelemetry/instrumentation-koa is in place. If anyone is interested in becoming a component owner, please refer to this comment for more details: #2028 (comment)