Catalog: Add Jmx catalog

[kuseman]

• Query a Jmx host for values
• Multi host query (wildcard like ES?) Host group config?

[kuseman]

The JMX system is really slow, don't know if this is viable.
Doing a scan for medium sized JVM with MBeans takes a considerable amount of time.
Might work with an index-only catalog where we need to provide mbean names to query.