EntityProvider prototype

[breedx-splk]

Here's an initial straw-man implementation in java of the EntityProvider described in otep-4316.

My first impressions are that the implementation itself is pretty basic and open to future tweaking/improvements (it's really just supposed to be a caching thread-safe CRUD bucket), but the interesting and more complicated stuff begins to happen when the EntityProvider is integrated with or otherwise used by other places in the code.

Right now, it is wired up into the SdkTracerProvider and has exposed builder methods on the SdkTracerProviderBuilder. I think there are bound to be breaking changes in that, so please feel free to call those out. Right now, there's also no way for users or instrumentations to get any handle to the "live" EntityProvider in order to add/update/delete any entities...it would have to be wired up entirely by the user and retained.

I also did not yet attempt to wire it up metrics or logs, because I figured there would be enough to talk about first with traces. :)

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 93.40659% with 6 lines in your changes missing coverage. Please review.

Project coverage is 89.85%. Comparing base (cc7d085) to head (f279641).

Files with missing lines	Patch %	Lines
...ntelemetry/sdk/trace/SdkTracerProviderBuilder.java	50.00%	5 Missing :warning:
.../opentelemetry/sdk/entities/SdkEntityProvider.java	98.48%	0 Missing and 1 partial :warning:

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #7360      +/-   ##
============================================
- Coverage     89.87%   89.85%   -0.02%     
- Complexity     6899     6921      +22     
============================================
  Files           786      789       +3     
  Lines         20793    20877      +84     
  Branches       2026     2034       +8     
============================================
+ Hits          18687    18760      +73     
- Misses         1465     1473       +8     
- Partials        641      644       +3     

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[jsuereth]

FYI - I rebooted the underlying Entities PR which includes OTLP1.7 support - https://github.com/open-telemetry/opentelemetry-java/pull/7434