Implement @oneOf input types

[captbaritone]

Support for the @oneOf RFC using syntax like:

/**
 * Models a node in a Markdown AST
 * @gqlInput
 * @oneOf
 */
type MarkdownNode =
  | { h1: string }
  | { h2: string }
  | { h3: string }
  | { p: string }
  | { blockquote: string }
  | { ul: string[] }
  | { li: string[] };

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