[WIP] entities prototype

[dyladan]

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

TODO:

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

Codecov Report

:x: Patch coverage is 25.89286% with 83 lines in your changes missing coverage. Please review. :white_check_mark: Project coverage is 94.27%. Comparing base (1c1dd01) to head (b82a1e7).

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

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #5620      +/-   ##
==========================================
- Coverage   95.17%   94.27%   -0.91%     
==========================================
  Files         316      317       +1     
  Lines        8521     8625     +104     
  Branches     1763     1789      +26     
==========================================
+ Hits         8110     8131      +21     
- Misses        411      494      +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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