uber / NullAway / 974

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Improved varargs support.

Resolves #290 by supporting vararg nullability.

Previously, we ignored the default nullability info of vararg arguments,
but would error out if the vararg formal was deemed non-null by a handler.

Instead, we now correctly acknowledge the nullability of vararg arguments
whether they are non-null due to default code assumptions or due to handlers
(restrictive annotations, `@Contract`, etc).

This PR also adds tests and support for `javax.annotations.Nonnull` which
we were ignoring before and is needed for those tests.

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