feat(tada): add isOneOf to the introspection type and support query

[JoviDeCroock]

Summary

Adds support for https://github.com/graphql/graphql-spec/pull/825

When we encounter an input marked as isOneOf: true we need to create a type that is an or of all the properties spelled out in said input-object.

• In the support-query we check whether __Type contains a isOneOf
• In the Introspection type we add isOneOf to the properties
• Add new branch in variables.ts that differentiates between | and &

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Latest commit: e958b8101026f9fa2729d180578e787cbc629684

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