RFR: 8264208: Console charset API [v11]

[Naoto Sato]

> Please review the changes for the subject issue.  This has been suggested in a recent discussion thread for the JEP 400 [[1](https://mail.openjdk.java.net/pipermail/core-libs-dev/2021-March/075214.html)]. A CSR has also been drafted, and comments are welcome [[2](https://bugs.openjdk.java.net/browse/JDK-8264209)].

Naoto Sato has updated the pull request with a new target base due to a merge or a rebase. The incremental webrev excludes the unrelated changes brought in by the merge/rebase. The pull request contains 13 additional commits since the last revision:

 - Refined the test case.
 - Merge branch 'master' into JDK-8264208
 - Changed shell based test into java based
 - Added link to Charset#defaultChaset() in InputStreamReader.
 - Modified javadocs per suggestions.
 - Added @see links.
 - Added Console::charset() relation with System.in
 - Added comment to System.out/err init.
 - Reflected further review comments.
 - Reverted PrintStream changes
 - ... and 3 more: https://git.openjdk.java.net/jdk/compare/8cc07521...e585d16f

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

Changes:
  - all: https://git.openjdk.java.net/jdk/pull/3419/files
  - new: https://git.openjdk.java.net/jdk/pull/3419/files/238dbb42..e585d16f

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=3419&range=10
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=3419&range=09-10

  Stats: 72701 lines in 1955 files changed: 33448 ins; 34099 del; 5154 mod
  Patch: https://git.openjdk.java.net/jdk/pull/3419.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/3419/head:pull/3419

PR: https://git.openjdk.java.net/jdk/pull/3419