Add arch test to detect usage of shared internal code #6978
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Related to #6970.
This test prints out instances of shared internal code use. We could eventually remove all the detected instances, at which point we could fail the build instead of just printing.
But there's a long way to go. See this gist for the current state of affairs.
Note: I don't currently have a good way to tell when internal code is referenced for things like the SDK's implementation of of
opentelemetry-api-incubating
, which is switched to a compile dependency in #6944.