Use dynamic arrow compute kernels

**Is your feature request related to a problem or challenge? Please describe what you are trying to do.**

@Jimexist added dyn kernels in https://github.com/apache/arrow-rs/pull/858 but we still have the dispatch logic in datafusion

The rationale for this change is to move most / all of the type dispatch into the arrow kernels, so that when we add support for directly comparing dictionary arrays (and others) in https://github.com/apache/arrow-rs/issues/869 the support will flow directly into DataFusion without additional changes in this repo

**Describe the solution you'd like**
Use the `eq_*` kernels, such as`eq_dyn` instead of dispatch logic in datafusion