Deprecate GHC.{TypeNats,TypeLits,ExecutionStack}.Internal

Deprecation of GHC.TypeNats.Internal, GHC.TypeLits.Internal and GHC.ExecutionStack.Internal (followed by removal in a subsequent release) was approved by the CLC here: https://github.com/haskell/core-libraries-committee/issues/217#issuecomment-2168836360

Tracking ticket: #23876

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