RFR: 8366261: Provide utility methods for sun.security.util.Password [v7]

[Naoto Sato]

> Providing a couple of utility methods using the "built-in" `Console` implementation to support tools that require password input, such as `keytool`, ensuring they work even when std0ut is redirected.

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

  Comment refined

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Changes:
  - all: https://git.openjdk.org/jdk/pull/26973/files
  - new: https://git.openjdk.org/jdk/pull/26973/files/9306bc0d..b928b2c2

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=26973&range=06
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=26973&range=05-06

  Stats: 3 lines in 1 file changed: 2 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/26973.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/26973/head:pull/26973

PR: https://git.openjdk.org/jdk/pull/26973