RFR: CODETOOLS-7903176: Move LJV inside JOL [v3]

[Aleksey Shipilev]

On Sun, 25 Sep 2022 07:44:50 GMT, Ivan Ponomarev <duke at openjdk.org> wrote:

>> 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:
> 
>   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>

There is a bunch of comments that was not addressed since last review, unfortunately.

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Changes requested by shade (Committer).

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