i#2626: AArch64 v8.2 codec: Add BCAX, EOR3, P/ESB instructions

Created by: joshua-warburton

This patch adds the following decodes, encoding macros and appropriate tests for both

   BCAX    <Bd>.16B, <Bn>.16B, <Bm>.16B, <Ba>.16B
   EOR3    <Bd>.16B, <Bn>.16B, <Bm>.16B, <Ba>.16B
   ESB
   PSB

These instructions are part of features that have not yet been added, so BASE has been used as a placeholder where appropriate

Issue: #2626