Support of serialization and deserialization of GraphqlSchemas

[tobiasdiez]

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

I have a quite complex graphql schema spreading over a couple of files. In order to improve the cold start time of the deployed server, I would like to perform the parsing and merging of the schema during build and not during runtime.

Describe the solution you'd like

Have helper methods that allow to serialize a GraphqlSchema AST (without resolvers) to say JSON, and then latter deserialize from it again to generate the GraphqlSchema. That is, a performant version of printSchema and loadSchema.

Describe alternatives you've considered

Serialize the merged schema using printSchema, and then load it at runtime via loadSchema. But I would like to move the "parse the schema to AST" to build time.