RFR: 8310047: Add UTF-32 based Charsets into StandardCharsets [v2]

[Naoto Sato]

> To make UTF-32 consistent with other UTF Charsets, making them available as `StandardCharsets`. A CSR has also been drafted.

Naoto Sato has updated the pull request incrementally with one additional commit since the last revision:

  Update test/jdk/java/nio/charset/StandardCharsets/Standard.java
  
  Co-authored-by: ExE Boss <3889017+ExE-Boss at users.noreply.github.com>

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

Changes:
  - all: https://git.openjdk.org/jdk/pull/14599/files
  - new: https://git.openjdk.org/jdk/pull/14599/files/ccfc225c..0eb1df40

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=14599&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=14599&range=00-01

  Stats: 2 lines in 1 file changed: 1 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/14599.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/14599/head:pull/14599

PR: https://git.openjdk.org/jdk/pull/14599