[5.0 WIP] Opaque types prototype #21957
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Context archetypes and opened existential archetypes differ in a number of details, and this simplifies the overlapping storage of the kind-specific fields. This should be NFC; for now, this doesn't change the interface of ArchetypeType, but should allow some refinements of how the special handling of certain archetypes are handled.
And clean up code that conditionally works only with certain kinds of archetype along the way.
To represent the abstracted interface of an opaque type, we need a generic signature that refines the outer context generic signature with an additional generic parameter representing the underlying type and its exposed constraints. Opaque types also need to be keyed by their originating decl, so that we can treat values of the same opaque type as the same. When we check a FuncDecl with an opaque type specified as its return type, create an OpaqueTypeDecl and associate it with the originating decl. (A representation for *types* derived from the opaque decl will come next.)
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5.0 version of #21137, for testing and evaluation purposes.