Add finder methods to builder

[MrLeebo]

Sample Schema

model Product {
  id     String  @id @default(auto()) @map("_id") @db.ObjectId
  name   String
  photos Photo[]

  thumbnailUrl String
  previewUrl   String
}

Find a model by name

const product = builder.findByType("model", { name: "Product" })
expect(product).toHaveProperty("name", "Product")

Find all fields by pattern

const [thumbnailUrl, previewUrl] = builder.findAllByType("field", { name: /Url/, within: product.properties })
expect(thumbnailUrl).toHaveProperty("name", "thumbnailUrl")
expect(previewUrl).toHaveProperty("name", "previewUrl")