ZGC Support for GraalVM Java 16

[bloxanne123]

Feature request

Is your feature request related to a problem? Please describe.
G1GC usually gives me numerous lagspikes, which is very annoying and causes issues for me. ZGC is finally finished to my knowledge and has sub 1ms pause times. I would like to combine this with the JVMCI compiler for even better performance.

Describe the solution you'd like.
Full ZGC support added to GraalVM Java 16

Describe who do you think will benefit the most.
GraalVM users

Describe alternatives you've considered.
Going back to GraalVM Java 11, or using normal Java 16 and ZGC.

Additional context.
N/A

Express whether you'd like to help contributing this feature
No.

[oubidar-Abderrahim]

Duplicate of #2149. Tracked internally on GR-27475