RFR: CODETOOLS-7903176: Move LJV inside JOL

[Ivan Ponomarev]

This moves https://github.com/atp-mipt/ljv project inside JOL in order for LJV to get access to internal JOL's APIs.

See blogposts about LJV [in Russian](https://habr.com/ru/post/599045/) /  [in English](https://dzone.com/articles/what-can-we-learn-from-java-data-structures-visual).

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Commit messages:
 - code cleanup
 - Move ljv inside jol (#2)
 - Merge remote-tracking branch 'upstream/master'
 - add ljv build
 - update dependencies and include ljv module
 - Merge remote-tracking branch 'ljv/master'
 - move ljv to subfolder
 - Bump maven-javadoc-plugin from 3.3.0 to 3.3.1 (#62)
 - Bump asciidoctorj-diagram from 2.1.2 to 2.2.1 (#60)
 - Bump junit-jupiter from 5.8.1 to 5.8.2 (#73)
 - ... and 83 more: https://git.openjdk.java.net/jol/compare/1b6d9fba...62672627

Changes: https://git.openjdk.java.net/jol/pull/24/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jol&pr=24&range=00
  Issue: https://bugs.openjdk.java.net/browse/CODETOOLS-7903176
  Stats: 4039 lines in 62 files changed: 4032 ins; 4 del; 3 mod
  Patch: https://git.openjdk.java.net/jol/pull/24.diff
  Fetch: git fetch https://git.openjdk.java.net/jol pull/24/head:pull/24

PR: https://git.openjdk.java.net/jol/pull/24