RFR: CODETOOLS-7903176: Move LJV inside JOL [v6]

[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).

Ivan Ponomarev has updated the pull request incrementally with one additional commit since the last revision:

  fix review comments

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Changes:
  - all: https://git.openjdk.org/jol/pull/24/files
  - new: https://git.openjdk.org/jol/pull/24/files/4d44d66e..042c17a1

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jol&pr=24&range=05
 - incr: https://webrevs.openjdk.org/?repo=jol&pr=24&range=04-05

  Stats: 19 lines in 4 files changed: 2 ins; 8 del; 9 mod
  Patch: https://git.openjdk.org/jol/pull/24.diff
  Fetch: git fetch https://git.openjdk.org/jol pull/24/head:pull/24

PR: https://git.openjdk.org/jol/pull/24