feat: add submap support and add pass_through submap

lua/binds/init.lua

@@ -1,23 +1,36 @@
 local M = {}
 local bind = require("lua.lib.bind")
+local utils = require("lua.lib.utils")
 
 local pieces = {
 	"apps",
 	"window",
 	"workspace",
+	"passthrough",
 }
 
 M.binds = {}
+M.submaps = {}
 
 for _, piece in pairs(pieces) do
-	local bind_piece = require("lua.binds." .. piece).binds
+	local p = require("lua.binds." .. piece)
+	local bind_piece = p.binds
 	for _, bind_item in pairs(bind_piece) do
 		table.insert(M.binds, bind_item)
 	end
+	local submap = p.submaps
+	if submap then
+		M.submaps = utils.tbl_recursive_merge(M.submaps, submap)
+	end
 end
 
 function M.load()
 	bind.map(M.binds)
+	for name, binds in pairs(M.submaps) do
+		hl.define_submap(name, function()
+			bind.map(binds)
+		end)
+	end
 end
 
 return M