Implement sys.get_pid function

[hulto]

Is your feature request related to a problem? Please describe.
The current workflow for getting the PID of our current process is to list all process and search for our processes name (assuming we know that). To help streamline this workflow a function to retrive the current process ID should be implemented.

Describe the solution you'd like

• When called the function should a number that represent the current PID.
• The rust std::Process crate could be useful

Describe alternatives you've considered
N/a

Additional context
N/a