Make it an error if a setter has a @Nullable parameter when the property being set is not @Nullable. We will generate code that rejects a null parameter whether or not @Nullable is present, so allowing it is just misleading users of the API.

The mirror situation, where the property is @Nullable but the setter is not, is arguably also incorrect. In that case the generated code does *not* reject a null parameter, even though we might expect it to in the absence of @Nullable on the parameter. However, changing that would surely break a lot of existing code.

Fixes https://github.com/google/auto/issues/777.

RELNOTES=It is now a compilation error if a setter method in a builder has a parameter marked @Nullable when the corresponding property is not in fact @Nullable. This already generated a NullPointerException at runtime.

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Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=289103954

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