Add ossf-scorecard scanning workflow

[opentelemetrybot]

See open-telemetry/community#2636 for details

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 86.31%. Comparing base (72a5f7c) to head (a25ee4e).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #6218      +/-   ##
==========================================
+ Coverage   86.23%   86.31%   +0.08%     
==========================================
  Files         259      259              
  Lines       11847    11847              
==========================================
+ Hits        10216    10226      +10     
+ Misses       1631     1621      -10     

Flag	Coverage Δ
unittests-Project-Experimental	86.23% <ø> (+0.13%)	⬆️
unittests-Project-Stable	85.96% <ø> (+0.05%)	⬆️
unittests-Solution	85.92% <ø> (-0.24%)	⬇️
unittests-UnstableCoreLibraries-Experimental	85.87% <ø> (ø)

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see 3 files with indirect coverage changes

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