feat(yazi): Add assertion to prevent conflicting keybinds

[lordkekz]

Description

Right now, you can accidentally define conflicting keybinds and you will not get any warning.
This PR adds an assertion which checks if there are any two keybinds A and B where the on value (sequence of keypresses) of A starts with the on value of B.

This is not yet finished but I will pick it up when I have time again.

Checklist

• Change is backwards compatible.

• Code formatted with ./format.

• Code tested through nix-shell --pure tests -A run.all or nix develop --ignore-environment .#all using Flakes.

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Maintainer CC

@XYenon @eljamm
btw would you be interested in me becoming a maintainer of the yazi module?
This is my second contribution to this module and I am also maintaining the nix-yazi-plugins repo (not afiliated with yazi or home-manager but relevant IMO), so I plan to keep contributing here in the forseeable future.