feature: alias for which-key bindings

[st0nie]

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.

As #160 says, there are times when we don't want to define our own set of keys, but rather use the keys we have already defined, just like I want to do the same with <c-w> by using <space>w, but there is a problem, if we remap directly to <c-w>, the which-key window doesn't appear, and if we noremap= false to <c-w>, we need to wait for timeoutlen for the which-key window to appear, so we need a better way to reuse our previously set shortcuts or preset shortcuts

Describe the solution you'd like

When the key you want to set is already set in the which-key, use the previous setting directly, e.g. ["<leader>w"] = { "<C-W>", "+window" ,name=""} should have the same effect as and should immediately trigger the which-key's window

Describe alternatives you've considered

add a function like

vim.g.WK_shown = false

wk.setup({
	key_labels = { ["<leader>"] = "SPC" },
})

local function wk_alias(keys)
	local timeout = vim.o.timeoutlen
	if vim.g.WK_shown then
		vim.o.timeoutlen = 0
	end
	local key_codes = vim.api.nvim_replace_termcodes(keys, true, false, true)
	vim.api.nvim_feedkeys(key_codes, "m", false)
	vim.defer_fn(function()
		vim.o.timeoutlen = timeout
		vim.g.WK_shown = false
	end, 10)
end

vim.api.nvim_create_autocmd({ "Filetype" }, {
	pattern = "WhichKey",
	callback = function()
		vim.g.WK_shown = true
	end,
})

This way we can set <leader>w as an alias for <c-w>, which is what I'm doing now

["<leader>w"] = {
	function()
		wk_alias("<c-w>")
	end,
	"+window",
	name = "",
},

Additional context

No response