RFR: 8345343: Restore the preview status of java.lang.classfile.components package

[Chen Liang]

The java.lang.classfile.components package was underused and had almost no usage feedback; as a result, it did not caught attention during the preview process of the Class-File API, until the late adoption when Class-File API is sure to become finalized. In the previous rounds of reviews by other engineers, most of the review efforts were devoted to other core modeling and API classes, and components was largely omitted; a few questions were asked, but no solution were proposed and the questions were forgotten.

To compensate in such a short time to the stabilization of JDK 24, we propose to restore the preview status of the java.lang.classfile.component package and its member classes. This allows us to better consider the role of this package and its members.

See https://mail.openjdk.org/pipermail/classfile-api-dev/2024-November/000611.html for initial problem discovery and https://mail.openjdk.org/pipermail/classfile-api-dev/2024-December/000613.html for revision proposal.

See the CSR for alternative solutions and why they were not chosen.

-------------

Commit messages:
 - 8345344: Restore the preview status of java.lang.classfile.components package

Changes: https://git.openjdk.org/jdk/pull/22501/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=22501&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8345343
  Stats: 28 lines in 7 files changed: 18 ins; 0 del; 10 mod
  Patch: https://git.openjdk.org/jdk/pull/22501.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/22501/head:pull/22501

PR: https://git.openjdk.org/jdk/pull/22501