[WIP] entities prototype

[dyladan]

Pulls in changes from the first prototype and applies them to the 2.0 SDK

TODO:

• e2e tests
• unit tests
• add entity detectors (process/host probably a good start)
• Make Entity a type/interface instead of a class because it is accessed from resource.entities
• Export pipeline

Open questions:

• Should detectors be able to detect resource attributes and entities, or just one or the other
• verify entity merge override ordering because it's the opposite of the current resource impl

[codecov]

Codecov Report

❌ Patch coverage is 25.89286% with 83 lines in your changes missing coverage. Please review.
✅ Project coverage is 94.11%. Comparing base (95b40aa) to head (d17b2cd).

Files with missing lines	Patch %	Lines
...ackages/opentelemetry-resources/src/entity-impl.ts	9.45%	67 Missing ⚠️
...kages/opentelemetry-resources/src/resource-impl.ts	54.28%	16 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #5620      +/-   ##
==========================================
- Coverage   95.06%   94.11%   -0.96%     
==========================================
  Files         307      308       +1     
  Lines        8031     8135     +104     
  Branches     1627     1653      +26     
==========================================
+ Hits         7635     7656      +21     
- Misses        396      479      +83     

Files with missing lines	Coverage Δ
...l/packages/otlp-transformer/src/common/internal.ts	100.00% <100.00%> (ø)
...es/opentelemetry-resources/src/detect-resources.ts	78.57% <100.00%> (ø)
...kages/opentelemetry-resources/src/resource-impl.ts	85.71% <54.28%> (ø)
...ackages/opentelemetry-resources/src/entity-impl.ts	9.45% <9.45%> (ø)

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