Process fields

Process fields carry a process id, executable path, leaf name, and product category when available.

Field	Type	Unit	Meaning
sparklogs.process.id	string		The process id in decimal form.
sparklogs.process.path	string		The full executable path as logged.
sparklogs.process.name	string		The executable's leaf file name.
sparklogs.process.class	string		The product category that ships the executable.