Add #import support

[vincentwinkel]

It could be awesome to add the supportt of #import, really useful for the fragments.
Example:

# File user.fragment.gql

fragment UserFragment on User {
  id
  email
}

# File query.user.gql

#import "./user.fragment.gql"
query user {
  user {
    ...UserFragment
  }
}

and then we just need to loadFile('query.user.gql');.

[tiago154]

Hi @vincentwinkel , thanks for the suggestion.

I implemented #import annotation support for the loadFile function.

Feel free to validate the operation by installing the version graphql-import-files@1.2.18