Support GraphQL draft syntax for multiple interface implementation.

[purplemana]

Per the spec, the multiple interface implementation syntax uses & instead of , as the separator, e.g.

type User implements Node & Paginated {

Currently graphql-s2s converts this to:

type User implements Node {

keeping only the first interface name.

An online repl is available here.

In addition to this, imho, the inherits syntax which is graphql-s2s specific, should also be changed to use & as name separator keeping both the syntax in harmony.

[nicolasdao]

Makes a lot of sense @purplemana. I agree with you.

I've added that to my list. I'll release that change with the next version of graphql-s2s.

Really appreciate you took the time to suggest that.

[greemo]

Great, +1, the comma use for multiple implementation on the output schema breaks my automation flow, as I must manually convert the commas to &s.