`graphql-modules` preset ignores `resolveType`

### Is your feature request related to a problem? Please describe.

The generated module's types doesn't include resolvers for unions, the designated resolvers are generated only on baseTypes file.

For example, if a "Users" module typeDefs are something like this:
```
type Query {
users: UsersResponse
}

union UsersResponse = usersSuccessfulResponse | Error

type usersSuccessfulResponse {
...
}

type Error {
...
}
```

baseTypes will include `UsersResponse` resolver (with __resolveType function), but "Users" module's types will include only resolvers for `usersSuccessfulResponse` and `Error`

### Describe the solution you'd like

Module's generated type file to include the resolveType resolvers

### Describe alternatives you've considered

import the resolver from baseTypes - which is less intuitive and results in extra imports

### Is your feature request related to a problem? Please describe.

_No response_