RFR: 8293667: Align jlink's --compress option with jmod's --compress option [v7]

[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.

Ian Graves has updated the pull request incrementally with three additional commits since the last revision:

 - Removing string compression plugin
 - Fixing errant compact-constant-pools
 - ShareUTF8Entries update

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Changes:
  - all: https://git.openjdk.org/jdk/pull/11617/files
  - new: https://git.openjdk.org/jdk/pull/11617/files/2af25227..92416003

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=11617&range=06
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=11617&range=05-06

  Stats: 377 lines in 4 files changed: 0 ins; 373 del; 4 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