Unbind all default keybindings config option

[Lindenk]

Describe your feature request

Allow all default keybindings to be set to no-op with a config option. While I'm very happy with Helix's design of giving commands and bindings descriptive names instead of using arcane keyboard keys (unlike vim and it's derivatives), it's currently both cumbersome and error prone to manually set every unused binding to no-op when remapping keys. If a precedent is needed, Zellij has a keybindings: unbind: <bool> config that does exactly this.

To be more specific, I propose the following configuration: unbind-defaults: <bool> which defaults to false. When set to true all default keybindings are not added to the keybinding trie (or set to no-op, whatever's easier) and only the bindings listed in the user's config file will be used.

[the-mikedavis]

When we switch to scheme config we want to make it possible to completely overwrite the default keymap which will solve this (see the keymap portion of #10441). So I will close this in favor of #10389