RFR: 8343054: Add support for a new `@info` javadoc block tag for API guidance

[Nizar Benalla]

This PR adds a new `@info` block tag to javadoc, it can be used to document general guidance for APIs.

Tests will be added to this patch later, CSR is still under review.

TIA

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Commit messages:
 - implement `@info` javadoc block tag

Changes: https://git.openjdk.org/jdk/pull/25215/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=25215&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8343054
  Stats: 285 lines in 21 files changed: 267 ins; 1 del; 17 mod
  Patch: https://git.openjdk.org/jdk/pull/25215.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/25215/head:pull/25215

PR: https://git.openjdk.org/jdk/pull/25215