Use dynamic arrow compute kernels

[alamb]

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

@jimexist added dyn kernels in apache/arrow-rs#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 apache/arrow-rs#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 aseq_dyn instead of dispatch logic in datafusion