seperate stage/ustage all files keybindings

[masriomarm]

Is your feature request related to a problem? Please describe. A clear and concise description of what the problem is. Ex. I'm always frustrated when [...] unstagging all files and then staged and unstaged files are combined and no longer able to retrieve staged changes.

Describe the solution you'd like A clear and concise description of what you want to happen. unstage all files can have different keybindings, "A" instead of "a"

Describe alternatives you've considered A clear and concise description of any alternative solutions or features you've considered. none...

Additional context Add any other context or screenshots about the feature request here. add more keybindings as well to search for file in staged/modified files. and a keybindings to jump to next/previous modified file.