Profiles support in OTLP receiver

[dmathieu]

Description

This adds profiles support to the OTLP receiver.

cc @mx-psi

[codecov]

Codecov Report

Attention: Patch coverage is 88.76404% with 10 lines in your changes missing coverage. Please review.

Project coverage is 91.84%. Comparing base (792a401) to head (9d6d9f9).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
receiver/otlpreceiver/otlphttp.go	60.00%	5 Missing and 3 partials ⚠️
receiver/otlpreceiver/factory.go	83.33%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #11071      +/-   ##
==========================================
- Coverage   91.86%   91.84%   -0.02%     
==========================================
  Files         413      415       +2     
  Lines       19766    19850      +84     
==========================================
+ Hits        18158    18232      +74     
- Misses       1239     1245       +6     
- Partials      369      373       +4     

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[mx-psi]

I think we should wait until open-telemetry/opentelemetry-proto#582 is merged (I don't mind if it's merged but not released, but I would like some sort of consensus)

[mx-psi]

@dmathieu Can you fix the merge conflicts? I can merge after that

[dmathieu]

Done.