feature: override trigger of register action

[componhead]

Did you check the docs?

• [X] I have read all the which-key.nvim docs

Is your feature request related to a problem? Please describe.

Hi. In the following code

M.name = "registers"

M.actions = {
  { trigger = '"', mode = "n" },
  { trigger = '"', mode = "v" },
  -- { trigger = "@", mode = "n" },
  { trigger = "<c-r>", mode = "i" },
  { trigger = "<c-r>", mode = "c" },
}

I'd like to override the actions omitting { trigger = "<c-r>", mode = "i" }, used for insertion of unicode characters (precisely <C-r>u)

Describe the solution you'd like

Put trigger customization in the plugin option setup.

Describe alternatives you've considered

Remove or change { trigger = "<c-r>", mode = "i" } binding

Additional context

No response

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