[feature] Eldritch sys.exec

[hulto]

Is your feature request related to a problem? Please describe.
Eldritch doesn't have a way to execute files.

Describe the solution you'd like
Create a function sys.exec that allows a user to execute a file on the system through the eldritch language.

• Should take a path to the binary as a string.
• Should receive an ordered list of strings as arguments for the binary.
• Should take a boolean value to run the program as a child of the current process or disown it.
• Should be thoroughly tested and work on Linux, Windows, and Mac.