Graph Project Migration, migrate graphql schema

[stwiname]

Description

Update the CLI migration command to migrate a graphql schema from a subgraph to a graphql schema that works with SubQuery.

Requirements

• Test coverage of at least 80% on new code changes
• Throws an error if there is a feature from the graph that is not currently possible with SubQuery, this should include any data types and directives. The Graph Schema Doc SubQuery Schema Doc

There is an entry point to implement this functionality which can be found here