REST API for Heap Dumps

Because the image contains only the runtime components of the JVM, without all of the collateral tools such as jmap and jcmd, it is not possible to easily obtain a heap dump.

We can add a new REST API

POST /rest/v2/server/memory?action=heap-dump[&live=true|false]

which creates a heap dump in the infinispan.server.data.dir and returns a JSON indicating the path of the heap dump:

{"path":"/opt/infinispan/server/data/dump16758740611738239236.hprof"}