RFR: 8319993: Update Unicode Data Files to 16.0.0

[Naoto Sato]

Updates the JDK to use the latest Unicode 16.0.0, which also updates the ICU4J along with it (8319992: Update ICU4J to Version 76.1). The corresponding CSR has already been approved.

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Commit messages:
 - icu.md changes
 - Merge branch 'master' into JDK-8319993-Unicode-16
 - Merge branch 'master' into JDK-8319993-Unicode-16
 - Merge branch 'master' into JDK-8319993-Unicode-16
 - Fixing UnicodeBlock aliases for TULU_TIGALARI
 - ICU4J 76.1 release
 - .md files
 - ICU4J changes
 - iniital commit

Changes: https://git.openjdk.org/jdk/pull/21771/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=21771&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8319993
  Stats: 8442 lines in 29 files changed: 7542 ins; 296 del; 604 mod
  Patch: https://git.openjdk.org/jdk/pull/21771.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/21771/head:pull/21771

PR: https://git.openjdk.org/jdk/pull/21771