nvim: Add function to cleanly unmap keys

Removes them from being active in vim as well as removing them from
being displayed in which-key.

Unfortunately the which-key implementation still seems broken, sometimes
removing them sometimes leaving them as-is.

nvim/.config/nvim/lua/core/util.lua

@@ -17,6 +17,17 @@ function T.get_plugin(plugin)
 	return nil
 end
 
+-- Remove the key from the vim keymap and from being displayed in which-key
+-- FIXME This does not consistently currently with which-key
+-- Every once in a while the maps are correctly hidden but other times they stay?
+function T.unmap_key(lhs, mode)
+	mode = mode or "n"
+	if T.is_available("which-key") then
+		vim.keymap.set(mode, lhs, "", { desc = "which_key_ignore", silent = true })
+	end
+	pcall(vim.keymap.del, mode, lhs)
+end
+
 -- from https://github.com/ray-x/navigator.lua/issues/247#issue-1465308677
 local function path_join(...)
 	return table.concat(vim.tbl_flatten({ ... }), "/")