feat: collection to queries

[nohehf]

Introduce a mode to "reverse" graphman:

• Export your API collection from your API Client (as postman format)
• Run graphman reverse <path_to_collection> (temporary command name)
• It generates a (.ts file with a list | json file) of graphql queries as strings

[nohehf]

closing this as it's now out of graphman scope.