Related problem

Somewhat related to #5951, but a lot of that is now handled.

A remaining problem is how to update and remove:

• Hooks
• Keybindings
• Menus

For instance, sourcing atuin.nu twice will result in duplicate hooks for pre_execute and pre_prompt and duplicate keybindings as well.

For keybindings and menus, it's possible to use a where to find the list item matching a certain name, but with hooks that's not possible since there's no "name" to work from.

Describe the solution you'd like

Shouldn't hooks, keybindings, and menus be entries in a record rather than a list? This would allow simple updates, singleton-inserts, and deletions:

# Singleton insert or update
$env.config.hooks.env_change.pre_execute.atuin = { ... }
$env.config.hooks.hooks.env_change.PWD.zoxide = { ... } 

# Delete hook
$env.config.hooks.env_change.pre_execute = $env.config.hooks.env_change.pre_execute | reject atuin

Describe alternatives you've considered

A standard library helper for menus and keybindings, but that won't work for hooks since there's currently no "identifier" (like name).

Additional context and details

No response