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Better Predicates (#1137)

Introduces new predicate and assertion functions for each kind of type mirroring the existing ones for the higher order types. It also includes predicates for directives and schema. This should remove the need to use `instanceof` in any usage of GraphQL.js

This consolidates the checking of instances which generalizes the cross-realm/multiple-module check so that the clearer error message is provided in nearly all scenarios, reducing confusion.

This also replaces nearly all `instanceof` with new predicate functions internally.

Fixes #1134

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