RFR: 8356985: Use "stdin.encoding" in Console's read*() methods [v4]

[Volkan Yazici]

On Wed, 21 May 2025 19:29:08 GMT, Naoto Sato <naoto at openjdk.org> wrote:

>> `java.io.Console` uses the charset specified by the `stdout.encoding` system property for both input and output. While this is generally sufficient, since Console is intended for interactive terminal use, some platforms allow different encodings to be configured for input and output. In such cases, using a single encoding may lead to incorrect behavior when reading from the terminal. To address this, the newly introduced system property, `stdin.encoding`, should be used specifically for input where appropriate.
>
> Naoto Sato has updated the pull request incrementally with one additional commit since the last revision:
> 
>   CharsetTest clean-up

Marked as reviewed by vyazici (Author).

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

PR Review: https://git.openjdk.org/jdk/pull/25271#pullrequestreview-2860206112