Provide the Option to Collect Data for a Specific Pid

[sfc-gh-wfateem]

The script right now just takes the class name that contains the main method implementation and loops through all the Java PIDs then gathers data from all of them.

That may be still useful for a user that wants to collect data from a single process, if there aren't any redundant processes with the same name, but perhaps giving the option to provide either the PID or the class name would offer more flexibility.