Add rewriter option to erase generics#946
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Sorbet erases generic types at runtime as they cannot be enforced. This means in runtime contexts we can drop generic types entirely, simplifying the rbs to sorbet signature translation This commit adds an `erase_generic_types` option to the `RBSCommentsToSorbetSigs` rewriter. When set, generic args are dropped from translated sigs (`Box[Integer]` to `Box`) and `extend T::Generic` is not added
Expose a flag to set the `erase_generic_types` option in `Spoom::Sorbet::Translate.rbs_comments_to_sorbet_sigs` so CLI users can drop generic types when translating from RBS to RBI
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WIP, implementation will change and RBI changes need to go in first