History of ZGC garbage collector

[AloisSeckar]

Follow-up to #293 and sybling task to #301

I have noticed, the history of "ZGC" garbage collector contains a number of somewhat connected JEPs spanning from JEP 333 where it was first introduced to most recent update JEP 490.

While I don't think this is the traditional "linking" demo, because it is not exactly the "incubator" => "preview" => "final" schema, the connection between them still should be mapped and somehow mentioned in comments, to give users better picture about the evolution of this garbage collector variant.

Currently, I have no clear idea about the actual task yet. I leave it open for someone daring enough to grab and shape this. If noone takes it, it will end up for me eventually.

---

NOTE: This is an ADVANCED task to help with. Be sure you understand the requirements. Check previous contributions with advanced label and ask if you have any questions or doubts before doing work that will not be helpful.

[adi-1204]

@AloisSeckar hello Sir can you assign the issue to me

[Akshay4754]

sir @AloisSeckar can u please assign this issue to me