Add docs on using spring actuator to debug issues

[planetf1]

Spring actuator can be enabled by setting the appropriate property:

java "-Dmanagement.endpoints.web.exposure.include=*" -jar open-metadata-implementation/server-chassis/server-chassis-spring/build/libs/server-chassis-spring-4.0-SNAPSHOT.jar &

Once run here are some examples of how to list metrics. We can also gather heapdumps, and check health.

All responses are json

The prometheus endpoint can be consumed by prometheus for more sophisticated use

Capturing these as rough notes, and will refine into proper docs