Fix == on arrays (#939)

Currently, doing `==` on arrays fails at runtime with
```
AttributeError: type object 'Array[models.__sharedstd__.__shapes__.std.uuid]' has no attribute '__gel_type_class__'
```
and produces a `bool` at typecheck time instead of a `type[std.bool]`.

My approach to fixing this is to replace uses of `Array` with
`std.array`, which has a `__gel_type_class__` and all the appropriate
overloadings.

When I extend this approach to other similar types, though, like
`Range`, I run into problems: the `typing_dispatch` based overloaded
constructor for range always fails when doing a
`Type.model_validate(r.model_dump())`, in part because the overloads
all seem to want want `std.bool` and won't accept real bools.

@elprans Does this seem like the right approach, and I should continue
down this path and fix any problems in the way (like those mentioned
above), or do you think I'm on the wrong track here?