Implement equals/hashcode for RequestOptions and TransitionOptions #4917
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It's a little tricky to get this right because we've defined equals/hashcode in the base classes, but are implementing them in the concrete classes. I think this implementation is actually safe because the base classes are abstract. However making equals transitive requires the weird equals() only implementations in the classes that have no properties but are concrete implementations of the base classes.
A safer way to do this would be to move the the equals/hashcode implementation out of the base class and re-implement it in each subclass. However that would require exposing a bunch of internal instance variables to subclasses. Given the existing structure and the public nature of the base classes, this seems like a reasonable compromise.
Fixes #4916