[FEATURE REQ] add stats not provided by the `gopsutil` library

[MadhavJivrajani]

Is your feature request related to a problem? Please describe.
The gopsutil library does not provide APIs for getting information about certain system parameters and metrics which might be important to know in certain cases such as the the scheduling policy of a process or information about software interrupts, hardware interrupts, etc as requested in #21

Describe the solution you'd like
For interrupt information /proc/interrupts would need to be parsed and /proc/PID/sched would need to be parsed for information such as the scheduling policy for the process.

This feature can be added as part of the export feature currently being worked upon.