Generate separate files - types and operations(query, mutations) from schema

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

Yes, I'm getting the schema and can't change it locally, so I need a generate command that will add 2 new files one for types and the other for operations(GraphQL documents), so I will be able to specify the path in my codegen "documents" config file

### Describe the solution you'd like

A command that will have a schema file as input and will generate 2 files (types, operations)

### Describe alternatives you've considered

using amplify-graphql-docs-generator to get operations from schema

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

yes, I can't get typed queries/mutations with codegen