Codegen args root

[galales]

This PR closes #560

Fix misalignment in arguments type names also at schema root levels (Query, Mutation and Subscription).
All arguments types names are now generated using the same function, so there should not be other similar issues.

The function prepends the "parent" name to the arguments type, in order to avoid possible duplications.

Note: names generated since this version will be different from the previous ones.

Example

The schema

type Query {
   user(id: Int): User!
}

type Mutation {
   setMessage(message: String): String!
}

is now generated as

case class Query(
   user: QueryUserArgs => zio.UIO[User]
)

case class Mutation(
   setMessage: MutationSetMessageArgs => zio.UIO[String]
)

while in the previous versions was

case class Query(
   user: UserArgs => zio.UIO[User]
)

case class Mutation(
   setMessage: SetMessageArgs => zio.UIO[String]
)

[ghostdogpr]

Looks good! Thanks for getting to the bottom of this!