Add experimental SDK entity support and OTLP export - #8464

- Create new Entity Detectors that are completely separate from existing
  reosurce detectors so entity must be FULL opt-in before behavior
  changes, even if OTLP is non-breaking.
- Wire "either/or" scenarios into resource factory and declarative
  config.

TODOs we need to sort out:

- Features of ResourceConfiguration spec that interact poorly with
  entities, e.g. attribute-specific filters that aren't entity aware,
  raw attribute definitions.
- Adding `env` as a supported detector for reading in Entity env
  variable propagation.
- Dealing with oddities of ResourceBuilder/Factory wanting to only use
  attributes in Java - we worked around it for now.

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_=/usr/bin/env resource providerr.

Get entity implementation ready for merging

…e entity aware service, service.instance resources