Add Input/Output File Sizes to Job Data

[ElphaTech]

Is your feature request related to a problem? Please describe.
It allows users to see if the media has actually become smaller (some media that is already small can become bigger after re-encoding) and would allow for automatically replacing it in future.

Describe the solution you'd like

• When the job is originally inputted, it should get the file size. This should be implemented in Move input.py to tui.py. #5
• Once a job is complete, it should record the output file size.