RFR: CODETOOLS-7903176: Move LJV inside JOL [v7]

[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 with a new target base due to a merge or a rebase. The pull request now contains 100 commits:

 - Merge remote-tracking branch 'upstream/master'
 - fix review comments
 - Merge pull request #7 from atp-mipt/jchekProblems
   
   jcheck Whitespace error fix
 - jcheck Whitespace error fix
 - leftover comments + braces (#6)
   
   * leftover comments + braces
   
   * remove leftover pom.xml
   
   * remove extra copyright comments
   
   Co-authored-by: Ivan Ponomarev <iponomarev at mail.ru>
 - minor changes (#5)
   
   * HashCodeCollision reimplementation
   * JDK headers fix
   *  LJV Github actions removed
   * other code review fixes
   
   Co-authored-by: Ivan Ponomarev <iponomarev at mail.ru>
 - update copyright notice, lint
 - code cleanup
 - Move ljv inside jol (#2)
   
   * sub module ljv in jol-core
   
   * LJV 1.7 JDK version
   
   Co-authored-by: Victor Petrosyan <viko20000 at mail.ru>
 - Merge remote-tracking branch 'upstream/master'
 - ... and 90 more: https://git.openjdk.org/jol/compare/482c0ee8...043009e8

-------------

Changes: https://git.openjdk.org/jol/pull/24/files
 Webrev: https://webrevs.openjdk.org/?repo=jol&pr=24&range=06
  Stats: 4177 lines in 59 files changed: 4176 ins; 0 del; 1 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