[WIP] avm2: Store resolved function param types

[adrian17]

It's an ugly WIP-POC-prototype thing. ResolvedParamConfig feels silly, maybe new gc-arena's Cell-like apis would help clean it up.
(I also wish the signature stuff was unified/shared between native and bytecode method types.)
Now that has_class_in_chain PR is merged, this passes all tests c:

This removes all runtime parameter type name lookups from function calls. In my microbenchmarks, for function f(a: int, b: int, c: int, d: int, e: int), this speeds up calls by ~30%.

The remaining overhead is

• mostly: UpdateContext cloning
• secondly: copying the arguments vec (twice!)
• other than that: general push/pop overhead

[Lord-McSweeney]

Superseded by #15884.