[WIP] entities prototype

[dyladan]

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

TODO:

• 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

Attention: Patch coverage is 26.78571% with 82 lines in your changes missing coverage. Please review.

Project coverage is 94.07%. Comparing base (dbbd032) to head (73de5fb).
Report is 14 commits behind head on main.

Files with missing lines	Patch %	Lines
...ackages/opentelemetry-resources/src/entity-impl.ts	9.45%	67 Missing ⚠️
...kages/opentelemetry-resources/src/resource-impl.ts	59.45%	15 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #5620      +/-   ##
==========================================
- Coverage   94.92%   94.07%   -0.85%     
==========================================
  Files         310      311       +1     
  Lines        7953     8047      +94     
  Branches     1605     1631      +26     
==========================================
+ Hits         7549     7570      +21     
- Misses        404      477      +73     

Files with missing lines	Coverage Δ
...es/opentelemetry-resources/src/detect-resources.ts	78.57% <100.00%> (ø)
...kages/opentelemetry-resources/src/resource-impl.ts	81.60% <59.45%> (ø)
...ackages/opentelemetry-resources/src/entity-impl.ts	9.45% <9.45%> (ø)

... and 2 files with indirect coverage changes

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