[Instrumentation.EntityFrameworkCore] Database metrics

[matt-hensley]

Changes

Ports database metrics from SqlClient to EF Core.

Merge requirement checklist

• CONTRIBUTING guidelines followed (license requirements, nullable enabled, static analysis, etc.)
• Unit tests added/updated
• Appropriate CHANGELOG.md files updated for non-trivial changes
• Changes in public API reviewed (if applicable)

[codecov]

Codecov Report

Attention: Patch coverage is 79.87013% with 31 lines in your changes missing coverage. Please review.

Project coverage is 74.90%. Comparing base (71655ce) to head (e995df3).
Report is 815 commits behind head on main.

Files with missing lines	Patch %	Lines
...mplementation/EntityFrameworkDiagnosticListener.cs	75.20%	31 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2707      +/-   ##
==========================================
+ Coverage   73.91%   74.90%   +0.99%     
==========================================
  Files         267        6     -261     
  Lines        9615      275    -9340     
==========================================
- Hits         7107      206    -6901     
+ Misses       2508       69    -2439     

Flag	Coverage Δ
unittests-Instrumentation.EntityFrameworkCore	74.90% <79.87%> (?)

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
...tityFrameworkCoreMeterProviderBuilderExtensions.cs	100.00% <100.00%> (ø)
...ityFrameworkCore/EntityFrameworkInstrumentation.cs	92.85% <100.00%> (-7.15%)	⬇️
...tyFrameworkCore/TracerProviderBuilderExtensions.cs	100.00% <100.00%> (ø)
...mplementation/EntityFrameworkDiagnosticListener.cs	74.21% <75.20%> (+21.82%)	⬆️

... and 258 files with indirect coverage changes

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[github-actions]

This PR was marked stale due to lack of activity. It will be closed in 7 days.

[matt-hensley]

Stable metrics have been released by the db convention WG. ORM metrics and a strategy combining database driver and ORM metrics has not been defined yet.

Need to determine an appropriate opt-in mechanism for ORM metrics.