RFR: 8344708: Compiler Implementation of Module Import Declarations [v7]

[Jan Lahoda]

> This is a patch to finalize the module imports feature. Please see:
> https://bugs.openjdk.org/browse/JDK-8344700

Jan Lahoda has updated the pull request with a new target base due to a merge or a rebase. The pull request now contains 13 commits:

 - Merge branch 'master' into JDK-8344708
 - Adjusting ToolProviderTest to the updated persistence handling.
 - Merge branch 'master' into JDK-8344708
 - Reflecting review feedback: cleanup formatting in ModuleInfo.
 - Reflecting review feedback - avoiding hardcoded constants.
 - Fixing test.
 - Cleanup, fixing tests.
 - Adjusting JShell defaults.
 - Fixing tests.
 - Cleanup - updated specification will permit requires transitive java.base; for all classfile versions; java.se no longer participates in preview.
 - ... and 3 more: https://git.openjdk.org/jdk/compare/1f228e55...da39d0ef

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Changes: https://git.openjdk.org/jdk/pull/23801/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=23801&range=06
  Stats: 432 lines in 32 files changed: 236 ins; 122 del; 74 mod
  Patch: https://git.openjdk.org/jdk/pull/23801.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/23801/head:pull/23801

PR: https://git.openjdk.org/jdk/pull/23801