[chore] add exporterhelperprofiles package

[dmathieu]

Description

This is extracted from #11131.
It adds profiles support for the epxorterhelper, so both the otlp and otlphttp exporters can support that signal.

It requires #11207 and #11225(done) to be merged first.

[codecov]

Codecov Report

Attention: Patch coverage is 92.13483% with 14 lines in your changes missing coverage. Please review.

Project coverage is 91.80%. Comparing base (18e4b49) to head (b740c57).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
.../exporterhelper/exporterhelperprofiles/profiles.go	91.80%	3 Missing and 2 partials ⚠️
exporter/exporterhelper/internal/obsexporter.go	0.00%	5 Missing ⚠️
...terhelper/exporterhelperprofiles/profiles_batch.go	97.75%	1 Missing and 1 partial ⚠️
exporter/exporterhelper/internal/request.go	0.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #11226      +/-   ##
==========================================
- Coverage   91.80%   91.80%   -0.01%     
==========================================
  Files         424      428       +4     
  Lines       20094    20259     +165     
==========================================
+ Hits        18447    18598     +151     
- Misses       1268     1279      +11     
- Partials      379      382       +3     

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