Move io.opentelemetry.sdk.internal to io.opentelemetry.sdk.common.internal

[jack-berg]

The opentelemetry-sdk-common module does not follow our packaging conventions. It has a decent amount of internal code in a package called io.opentelemetry.sdk.internal, which should be in io.opentelemetry.sdk.common.internal.

The problem with io.opentelemetry.sdk.internal is that we have another module opentelemetry-sdk, whose root package is io.opentelemetry.sdk. By coincidence, opentelemetry-sdk hasn't needed any internal code up to this point. But in discussion for PR#7991, I believe that's changing and opentelemetry-sdk will now need internal code. And we have a conflict if both opentelemetry-sdk-common and opentelemetry-sdk both publish to the io.opentelemetry.sdk.internal package.

opentelemetry-sdk-common should move its internal code to the proper package io.opentelemetry.sdk.common.internal to conform with the conventions of this repo.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 90.13%. Comparing base (8e332fc) to head (5ff8db5).

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #8003      +/-   ##
============================================
- Coverage     90.15%   90.13%   -0.02%     
+ Complexity     7476     7475       -1     
============================================
  Files           834      834              
  Lines         22540    22540              
  Branches       2236     2236              
============================================
- Hits          20320    20317       -3     
- Misses         1515     1517       +2     
- Partials        705      706       +1     

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