RFR: 8330276: Console methods with explicit Locale

[Naoto Sato]

Proposing new overloaded methods in `java.io.Console` class that explicitly take a `Locale` argument. Existing methods rely on the default locale, so the users won't be able to format their prompts/outputs in a certain locale explicitly.

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Commit messages:
 - Not using System.err
 - spacing
 - initial commit

Changes: https://git.openjdk.org/jdk/pull/18923/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=18923&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8330276
  Stats: 370 lines in 7 files changed: 289 ins; 0 del; 81 mod
  Patch: https://git.openjdk.org/jdk/pull/18923.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/18923/head:pull/18923

PR: https://git.openjdk.org/jdk/pull/18923