sprinkles: use gitoxide instead of git2

[jewlexx]

The performance gains are insane.
(i.e cloning the extras bucket takes about 60 seconds using git2, 10 seconds using the git command, and 8 seconds using gitoxide).

• perf(sprinkles): use gitoxide for revwalks  #735
• Figure out progress
• Use gitoxide for pulling
• Use gitoxide for cloning