feat(instrumentation): Add JMC Agent Mbean to allowed operations on /mbean-invoke/ (#769)

Author: Josh-Matsuoka

src/main/java/io/cryostat/agent/remote/InvokeContext.java

@@ -149,6 +149,8 @@ static class MBeanInvocationRequest<T> {
                 "com.sun.management:type=HotSpotDiagnostic";
         private static final String DIAGNOSTIC_COMMAND_BEAN_NAME =
                 "com.sun.management:type=DiagnosticCommand";
+        private static final String JMC_AGENT_BEAN_NAME =
+                "org.openjdk.jmc.jfr.agent:type=AgentController";
 
         public boolean isValid() {
             if (CRYOSTAT_AGENT_BEAN_NAME.equals(beanName)) {
@@ -163,6 +165,9 @@ public boolean isValid() {
                             || DUMP_THREADS_TO_FIlE.equals(this.operation))) {
                 return true;
             }
+            if (JMC_AGENT_BEAN_NAME.equals(beanName)) {
+                return true;
+            }
             return false;
         }