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[RFC] Type extension syntax

This proposal introduces a syntactic addition for client-side tools that perform code generation. It allows those tools to describe "extensions" to the server-supplied GraphQL schema. Tools may then use this information to generate client side Plain-Ol'-Data types which include these client-side-only extensions.

The syntax I'm proposing is:

```
TypeExtensionDefinition : `extend` ObjectDefinition
```

An example of this might look like:

```
type User {
  name: String
  birthday: Int
}

extend type User {
  age: Int
}
```

While I could have proposed simply `extend User { ... }`, I chose to fully reuse the ObjectDefinition rule to preserve the future ability to expand this syntax to include extending interfaces, enums, and other types.

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