Enforce limits on memory usage for JsIsolate

Checked if the JsIsolate supports being memory capped.
If supported, and enforced restrict max memory.

Test: Added test thet check for using the isolate setting to:
- bypass enforcement
- have unbounded memory isloate
- have bounded memory isolate

Bug: 239719630

Change-Id: Ie9dc4dbcf529e54eec912f66b0ad1da637dcae96