RFR: 8345431: Detect duplicate entries in jar files with jar --validate

[Henry Jen]

This PR check the jar file to ensure entries are consistent from the central directory and local file header. Also check there is no duplicate entry names that could override the desired content by accident.

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Commit messages:
 - 8345431: Detect duplicate entries in jar files with jar --validate

Changes: https://git.openjdk.org/jdk/pull/24430/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=24430&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8345431
  Stats: 118 lines in 4 files changed: 98 ins; 2 del; 18 mod
  Patch: https://git.openjdk.org/jdk/pull/24430.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/24430/head:pull/24430

PR: https://git.openjdk.org/jdk/pull/24430