RFR: CODETOOLS-7903176: Move LJV inside JOL

[Aleksey Shipilev]

On Tue, 3 May 2022 08:47:17 GMT, Ivan Ponomarev <duke at openjdk.java.net> 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).

Thanks for contribution!

Before continuing with code review, there are some high-level things involved in this. I see there are multiple contributors for the incoming changesets. I believe all of them should have signed OCA on file, or their changesets should not be present in this PR (I see some were adding "slides" that are not present in this PR). Right, @robilad? 

You can use `/contributor add @<github-id>` to mark them as contributors, I'd expect OpenJDK bots would then block the PR until OCAs are present.

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