refactor(treesitter): simplify some range functions

runtime/lua/vim/treesitter/_range.lua

@@ -53,6 +53,26 @@ M.cmp_pos = {
 
 setmetatable(M.cmp_pos, { __call = cmp_pos })
 
+---@private
+---Check if a variable is a valid range object
+---@param r any
+---@return boolean
+function M.validate(r)
+  if type(r) ~= 'table' or #r ~= 6 and #r ~= 4 then
+    return false
+  end
+
+  for _, e in
+    ipairs(r --[[@as any[] ]])
+  do
+    if type(e) ~= 'number' then
+      return false
+    end
+  end
+
+  return true
+end
+
 ---@private
 ---@param r1 Range4|Range6
 ---@param r2 Range4|Range6