[compiler][optim] Add map and set constructors (#32697)

* Adds `isConstructor: boolean` to `FunctionType`. With this PR, each
typed function can either be a constructor (currently only known
globals) or non constructor. Alternatively, we prefer to encode
polymorphic types / effects (and match the closest subtype)

* Add Map and Set globals + built-ins
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* #32698
* __->__ #32697