RFR: 8356634: VectorShape#largestShapeFor should have public access [v4]

[Ian Graves]

> VectorShape#largestShapeFor is referenced in existing JavaDoc but has been package-private. This propose change makes it public and adds documentation for it.

Ian Graves has updated the pull request incrementally with one additional commit since the last revision:

  Adding test coverage

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Changes:
  - all: https://git.openjdk.org/jdk/pull/25513/files
  - new: https://git.openjdk.org/jdk/pull/25513/files/8b3f6fc4..097bd9dd

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=25513&range=03
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=25513&range=02-03

  Stats: 43 lines in 1 file changed: 42 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/25513.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/25513/head:pull/25513

PR: https://git.openjdk.org/jdk/pull/25513