RFC Allow recursion within ResolveAbstractType

[yaacovCR]

This formalizes the proprosed feature within graphql-js whereby the internal method provided by JavaScript for runtime type resolution is allowed to return an intermediate interface.

See: Issue: https://github.com/graphql/graphql-js/issues/3253 PR: https://github.com/graphql/graphql-js/pull/3599

@IvanGoncharov suggested that this would require a spec change. Alternatively, perhaps the recursion should be considered to be a feature of the internal system itself, possibly limited to JavaScript-like implementations.

This PR provides some potential spec text, were a spec change to be considered necessary.

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