Support ETL context switches and total PMC counts

[albertziegenhagel]

Supports context switch events in ETL files. This includes extracting optional PMC counter information from those events and computing the accumulated event count per tread.

[codecov]

Codecov Report

Attention: Patch coverage is 88.33333% with 14 lines in your changes missing coverage. Please review.

Project coverage is 83.13%. Comparing base (52a35b6) to head (5bec090).
Report is 4 commits behind head on main.

Files with missing lines	Patch %	Lines
snail/analysis/detail/etl_file_process_context.cpp	91.66%	2 Missing and 5 partials ⚠️
snail/analysis/etl_data_provider.cpp	64.28%	3 Missing and 2 partials ⚠️
snail/analysis/perf_data_data_provider.cpp	77.77%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #66      +/-   ##
==========================================
+ Coverage   82.97%   83.13%   +0.15%     
==========================================
  Files         103      103              
  Lines        4499     4600     +101     
  Branches      876      899      +23     
==========================================
+ Hits         3733     3824      +91     
- Misses        369      374       +5     
- Partials      397      402       +5     

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