redis: add a test script for monitoring

src/redis/misc/monitor.sh

+#!/usr/bin/env bash
+
+# Set database to event listening and then watch DB 0 for changes (SET action)
+
+keydb-cli "$@" <<-EOF
+        CONFIG SET notify-keyspace-events KEA
+        PSUBSCRIBE '__keyevent@0__:set'
+EOF
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