[pdata/pprofile] add ProfileCount()

[florianl]

Description

Similar to (Logs) LogRecordCount() int, (Metrics) MetricCount() int and (Traces) SpanCount() int add ProfileCount().

Link to tracking issue

Fixes #

Testing

Documentation

[codspeed-hq]

CodSpeed Performance Report

Merging #14239 will degrade performances by 37.24%

_{Comparing florianl:profiles-count (3ac14bc) with main (152042e)}

⚠️ Unknown Walltime execution environment detected

Using the Walltime instrument on standard Hosted Runners will lead to inconsistent data.

For the most accurate results, we recommend using CodSpeed Macro Runners: bare-metal machines fine-tuned for performance measurement consistency.

Summary

❌ 1 regression
✅ 72 untouched

⚠️ Please fix the performance issues or acknowledge them on CodSpeed.

Benchmarks breakdown

	Benchmark	BASE	HEAD	Change
❌	zstdNoConcurrency	36.5 µs	58.1 µs	-37.24%

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 92.15%. Comparing base (152042e) to head (3ac14bc).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #14239      +/-   ##
==========================================
- Coverage   92.18%   92.15%   -0.03%     
==========================================
  Files         668      668              
  Lines       41463    41472       +9     
==========================================
- Hits        38223    38220       -3     
- Misses       2209     2217       +8     
- Partials     1031     1035       +4     

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