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Main usages of using global JSContext in servo are from realms, so with this PR we introduce safe realm concepts that are derived from JSContext (this allows us to enforce LIFO of realms). We also introduce counterpart to servos
AlreadyInRealmandInRealm: https://github.com/servo/servo/blob/main/components/script_bindings/realms.rs. Eventually these new safe types should replace old servo types. Because this change make it hard to use runtime I removed most methods from it.