[WIP] Extended functionality of gopsutil

[MadhavJivrajani]

Description

• Used the ps command to get the scheduling policy assigned to a process.
• Used the procfs package to get the frequency of operation of each CPU.

Partly solves #35

Type of change

Please delete options that are not relevant.

• New feature (non-breaking change which adds functionality)
• This change requires a documentation update

Checklist:

• I have read the contribution guidelines and followed it as far as possible.
• I have performed a self-review of my own code (if applicable)
• I have commented my code, particularly in hard-to-understand areas (if applicable)
• I have run go fmt on my code (reference)
• I have made corresponding changes to the documentation (if applicable)
• My changes generate no new warnings
• Any dependent and pending changes have been merged and published

Note:

• These features will be merged as part of the export feature, but separate issues pertaining to include them in the TUI should be created.
• Discussion might be required to decide on what additional features should be added as part of issue [FEATURE REQ] add stats not provided by the gopsutil library #35