feat: split decoder CLI interface from separate (shared) class (#1028)

* decoder cleanup

* add cli wrapper for new decoder interface

Author: baltzell

bin/decoder4u

@@ -0,0 +1,13 @@
+#!/bin/bash
+
+. `dirname $0`/../libexec/env.sh
+
+split_cli $@
+
+export MALLOC_ARENA_MAX=1
+
+java -Xmx2304m -Xms1280m -XX:+UseSerialGC ${jvm_options[@]} \
+    -cp ${COATJAVA_CLASSPATH:-''} \
+    org.jlab.detector.decode.CLASDecoder4U \
+    ${class_options[@]}
+