Adds plugin for git interactive checkout

[adamsir]

Standards checklist:

• The PR title is descriptive.
• The PR doesn't replicate another PR which is already open.
• I have read the contribution guide and followed all the instructions.
• The code follows the code style guide detailed in the wiki.
• The code is mine or it's from somewhere with an MIT-compatible license.
• The code is efficient, to the best of my ability, and does not waste computer resources.
• The code is stable and I have tested it myself, to the best of my abilities.
• If the code introduces new aliases, I provide a valid use case for all plugin users down below.

Changes:

• plugin which allows to do a quick switch between git branches

Other comments:

...

[LunarWatcher]

On top of the other comments, it's probably also a good idea to error check the git commands. Outside a git repo, at least two git commands are executed before the function stops:

❯ gci
fatal: not a git repository (or any of the parent directories): .git
fatal: not a git repository (or any of the parent directories): .git

[LunarWatcher]

This needs to be replaced with a proper title

[LunarWatcher]

This should arguably return a non-zero code, as it's an error state. Even then, why is this a loop at all? Both branches break, so there's no looping in any scenario

[LunarWatcher]

If this was supposed to be a continue and not a break, the echo -n on line 39 should be moved into the loop as well

[LunarWatcher]

This doesn't necessarily need to be changed (it's not a problem, nor something I consider a significant problem), but why have a function-local constant as a variable if it can't be configured in some way?