Optimize InstrumentationSelection

[mariomac]

Replaces the map[string]bool internal implementation of InstrumentationSelection by a bitmap, which would save a considerable CPU time in scenarios with high throughput of spans.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 95.45455% with 1 line in your changes missing coverage. Please review.

Project coverage is 80.35%. Comparing base (1ca08e4) to head (f617bf6).

Files	Patch %	Lines
.../internal/export/instrumentations/instr_options.go	95.45%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #965      +/-   ##
==========================================
+ Coverage   76.85%   80.35%   +3.50%     
==========================================
  Files         134      134              
  Lines       10477    10487      +10     
==========================================
+ Hits         8052     8427     +375     
+ Misses       1911     1558     -353     
+ Partials      514      502      -12     

Flag	Coverage Δ
integration-test	56.03% <54.54%> (?)
k8s-integration-test	58.90% <45.45%> (-0.08%)	⬇️
oats-test	36.14% <50.00%> (-0.05%)	⬇️
unittests	49.03% <95.45%> (+0.02%)	⬆️

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[grcevski]

LGTM! Sweet!