Add git integration

[RealA10N]

Users may want to commit and push their solutions. This is why we want to integrate git with cptk and provide the following options:

• Automatically commit after submitting code to a single problem
• Automatically push after submitting code to a single problem
• Automatically commit before the end of a session (multiple problems)
• Automatically push before the end of a session
• Edit and customize commit messages

Examples of formats for commit messages:

Solved {number} problems
{'\n'.join(f''{p.name} - {p.url}" for p in problems)}

Solved {numberSolved}, Resubmitted {numberResubmitted}

etc.