Adds support for view and type blocks

[infomiho]

Adds support for view and type blocks by reusing the model parser.

[infomiho]

@Martinsos Now I've implemented the view and type parser based on importing the body parser from Wasp.Psl.Ast.Model module. Looks cleaner and it's clear that the view and type blocks are "model-like" blocks.

[Martinsos]

Nice! Approved but also left a couple of smaller comments.

[Martinsos]

So does type actually support anything that can go into Model body, or is it a subset? That is relevant both here for AST and also for parser. If it is indeed anything that goes into model, then great. If not (and I would guess so, at least for view), then I would consider putting a comment here explaining that a bit.
Same goes for view.

[infomiho]

So does type actually support anything that can go into Model body, or is it a subset?

I'm only looking at this from the point of view of Prisma grammar and type and view are separate blocks. They are not subsets of model in any way.

You can however, use composite types (type block) in models by using them as field types e.g.:

model MyModel {
  id String @id
  someType SomeType
}

type SomeType {
  name String
  age Int
}

[infomiho]

Added some comments to both view and type.

[Martinsos]

i meant in the sense that their ast/parser is subset of model's