justin-millman / Kvasir / 16401577818 / 1

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Harden Rule Around Nullability of Relations

This commit hardens the translation logic regarding nullability and Relations. In particular:

   * Relations cannot be natively nullable
   * Natively nullable Relations that are annotated as [NonNullable] are supported
   * The element of an unordered list- or set-like Relation cannot be natively nullable
   * The key of a map-like Relation cannot be natively nullable

A few unit tests have been tweaked, and a handle of additional tests have been written. A new exception type has been
added to indicate when something is impermissibily natively nullable.

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