RFR: 8293667: Align jlink's --compress option with jmod's --compress option

[Ian Graves]

This is an approach to adding a flag to jlink that will allow --compress to take the same types of arguments as jmod, thus bringing the two into alignment. This likely requires a CSR and a discussion on whether we should deprecate or simply remove the original numeric compression arguments.

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Commit messages:
 - 8293667: Align jlink's --compress option with jmod's --compress option

Changes: https://git.openjdk.org/jdk/pull/11617/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=11617&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8293667
  Stats: 95 lines in 5 files changed: 87 ins; 3 del; 5 mod
  Patch: https://git.openjdk.org/jdk/pull/11617.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/11617/head:pull/11617

PR: https://git.openjdk.org/jdk/pull/11617