[exporter/nopexporter] Add the nopexporter

[evan-bradley]

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Description:

Add the nopexporter. This can be helpful if a user wants to start the Collector with a dummy pipeline to only enable extensions. It could also be used to test Collector pipeline throughput.

Link to tracking Issue:

Resolves https://github.com/open-telemetry/opentelemetry-collector/issues/7316

Testing:

Added lifecycle tests; the receiver doesn't do anything.

Documentation:

Added a readme for the component.

cc @djaglowski @tigrannajaryan

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 73.33333% with 4 lines in your changes are missing coverage. Please review.

Project coverage is 90.93%. Comparing base (2413346) to head (99b2cf7).

Files	Patch %	Lines
.../nopexporter/internal/metadata/generated_status.go	0.00%	4 Missing :warning:

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #9448      +/-   ##
==========================================
- Coverage   90.95%   90.93%   -0.02%     
==========================================
  Files         350      352       +2     
  Lines       18576    18591      +15     
==========================================
+ Hits        16895    16906      +11     
- Misses       1354     1358       +4     
  Partials      327      327              

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[evan-bradley]

My only bikeshed would be nop vs noop but both are acceptable spellings.

I would prefer noop myself, but it seems like nop is more conventional in Go and within the Collector. If others feel the same way, I'm open to changing the name.

[tigrannajaryan]

My only bikeshed would be nop vs noop but both are acceptable spellings.

I would prefer noop myself, but it seems like nop is more conventional in Go and within the Collector. If others feel the same way, I'm open to changing the name.

+1 to nop. One less character.

[dmitryax]

@evan-bradley please run make gogenerate to make CI green

[evan-bradley]

@dmitryax Took a bit of tweaking. Should be good to go now.