[ARROW-18038] [Archery][CI] Refactor git dependencies used on archery to be more consistent

• Type: Improvement
• Status: Open
• Priority: Major
• Resolution: Unresolved
• Component/s: Archery
• External issue URL: https://github.com/apache/arrow/issues/33241
• Assignee: Unassigned
• Reporter: Raúl Cumplido
• Created: 13/Oct/22 15:54
• Updated: 11/Jan/23 11:57

Description

Currently archery has the following git related dependencies:

    'release': ['gitpython']
    'crossbow': ['github3.py', 'pygit2>=1.6.0']
    'crossbow-upload': ['github3.py']
    'bot': ['github3.py', 'pygit2>=1.6.0', 'pygithub']

that makes difficult to work with archery git related code and makes more difficult code reuse. As an example the comment on this PR: https://github.com/apache/arrow/pull/14033#discussion_r993778812

While dev/archery/archery/crossbow/core.py uses pygit2, dev/archery/archery/release/core.py uses GitPython. The Repo class that is used in each module are also not shared. 

We should refactor archery to not require 2 different github libraries (github3 and pygithub) and 2 different git ones (pygit and gitpython).