[jdk20] RFR: 8299689: Make use of JLine for Console as "opt-in" [v2]

[Naoto Sato]

> Due to the fact that JLine spawns native processes to obtain terminal information on macOS/Linux, we decided to disable the JLine by default for performance degradation reasons. It is still possible to enable it by specifying it on the command line with `jdk.console` system property (not a public one though). Once we have a solution to avoid spawning processes, JLine may be back for use in the future.

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

  Addressing review suggestions

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Changes:
  - all: https://git.openjdk.org/jdk20/pull/88/files
  - new: https://git.openjdk.org/jdk20/pull/88/files/b15a8bda..9a948725

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk20&pr=88&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk20&pr=88&range=00-01

  Stats: 15 lines in 3 files changed: 6 ins; 6 del; 3 mod
  Patch: https://git.openjdk.org/jdk20/pull/88.diff
  Fetch: git fetch https://git.openjdk.org/jdk20 pull/88/head:pull/88

PR: https://git.openjdk.org/jdk20/pull/88