RFR: 8366475: Rename MetaspaceShared class to AOTMetaspace

[Ioi Lam]

Rename this class to with a naming convention that's consistent with other new AOT classes such as AOTClassLinker.

All changes are mechanical text replacement. Headers are resorted alphabetically.

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Depends on: https://git.openjdk.org/jdk/pull/27016

Commit messages:
 - Rename MetaspaceShared -> AOTMetaspace

Changes: https://git.openjdk.org/jdk/pull/27017/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=27017&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8366475
  Stats: 356 lines in 56 files changed: 30 ins; 30 del; 296 mod
  Patch: https://git.openjdk.org/jdk/pull/27017.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/27017/head:pull/27017

PR: https://git.openjdk.org/jdk/pull/27017