feat: add mergeTable func

merge_table.lua

@@ -0,0 +1,20 @@
+-- merge src value to target table
+local function merge(target, src)
+  if not target then target = {} end
+  if not src then return target end
+  for k,v in pairs(src) do
+    local value = target[k]
+    if type(v) == "table" then
+      if type(value) ~= "table" then
+        value = {}
+        target[k] = value
+      end
+      merge(value, v)
+    else
+      target[k] = v
+    end
+  end
+  return target
+end
+
+return merge