RFR: 8354556: Expand value-based class warnings to java.lang.ref API [v3]

[Vicente Romero]

> This PR is defining a new internal annotation, `@jdk.internal.RequiresIdentity`, with target types PARAMETER and TYPE_PARAMETER. The @RequiresIdentity annotation expresses the expectation that an argument to a given method or constructor parameter will be an object with a unique identity, not an instance of a value-based class; or that the type argument to a given type parameter will not be a value-based class type.
> 
> For more details please refer to the complete description in the corresponding JIRA entry [1]
> 
> TIA
> 
> [1] https://bugs.openjdk.org/browse/JDK-8354556

Vicente Romero has updated the pull request with a new target base due to a merge or a rebase. The pull request now contains 23 commits:

 - Merge branch 'master' into JDK-8354556
 - updating test
 - final adjustments
 - additional refactorings
 - removing unneeded changes
 - more refactorings
 - more refactorings and tests
 - refactoring
 - refactoring
 - covering more cases plus refactoring in order to simplify the code
 - ... and 13 more: https://git.openjdk.org/jdk/compare/60ba81d7...151908a2

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Changes: https://git.openjdk.org/jdk/pull/24746/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=24746&range=02
  Stats: 494 lines in 25 files changed: 468 ins; 6 del; 20 mod
  Patch: https://git.openjdk.org/jdk/pull/24746.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/24746/head:pull/24746

PR: https://git.openjdk.org/jdk/pull/24746