REF: simplify should_extension_dispatch, remove dispatch_to_extension_op #32892
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dispatch_to_extension_op was needed back before we got rid of integer-addition for DTA/TDA/Timestamp/Timedelta. Now it reduces to a one-liner, which this inlines.
This also consolidates all of the casting/checks up-front, which in turn avoids a runtime import and simplifies the check for should_extension_dispatch.