RFR: 8324665: Loose matching of space separators in the lenient date/time parsing mode [v2]

[Naoto Sato]

> Implementing "loose matching" of space separators in both `java.time.format.DateTimeFormatter` and `java.text.DateFormat` on lenient parsing. This will effectively fix the NNBSP issues on parsing time with am/pm markers introduced with CLDR version 42 (https://inside.java/2023/03/28/quality-heads-up/). A draft CSR has also been drafted.

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

  Reworded spec

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

Changes:
  - all: https://git.openjdk.org/jdk/pull/17678/files
  - new: https://git.openjdk.org/jdk/pull/17678/files/aef2bcfc..0c950941

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=17678&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=17678&range=00-01

  Stats: 9 lines in 2 files changed: 2 ins; 0 del; 7 mod
  Patch: https://git.openjdk.org/jdk/pull/17678.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/17678/head:pull/17678

PR: https://git.openjdk.org/jdk/pull/17678