Allows listing commits from a specific branch

[fdev31]

Description

While adding a "cherry-pick" command to neovim, I couldn't figure how to list commits from a specific branch and needed such change to allow that.

With this patch I could successfully implement the sequence:

• pick a branch
• pick a commit from that branch
• cherry-pick that commit

Type of change

• New feature (non-breaking change which adds functionality)
• This change requires a documentation update

How Has This Been Tested?

• tested on code requiring this new feature
• tested "plain" (no arguments) git_commits too

Configuration:

• Neovim version (nvim --version): v0.11.1
• Operating system and version: Arch Linux

Checklist:

• My code follows the style guidelines of this project (stylua)
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation (lua annotations)

[alerque]

CI jobs on this should be safe to trigger ...

[fdev31]

Do I need to do something ? (tests are looking stuck...)