Extract nullable state operations to extension methods. (#31188)
Add tests to demonstrate that they are associative and commutative. Add (skipped) tests to demonstrate that we have inconsistent meet and join functions. We will have to decide how to handle the differences. I have not yet extracted the NullableState operations from ConversionsBase (e.g. testing if one NullableState is higher or lower than another in the lattice) Also removed some inoperative code in MethodTypeInference
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