Rewrite schema printer

[patrick91]

Currently our schema printer is hacked on top of GraphQL-core's printer to add support for custom schema directives, default values for JSON scalar (and similar) and probably more stuff.

We also want to be abstracted from GraphQL-core so the new printer should only work with Strawberry types (and not use anything from the graphql package).

This is probably going to take a bit of time and we'll probably need much more tests to make sure we are spec compliant and don't change how the schema is printed.

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