[Refactor] remove lv prefix (#1112)

* Rename lv-utils into utils

* Move commands defined in utils into core/commands.lua

lua/core/commands.lua

@@ -0,0 +1,21 @@
+local M = {}
+
+M.defaults = {
+  [[
+  function! QuickFixToggle()
+    if empty(filter(getwininfo(), 'v:val.quickfix'))
+      copen
+    else
+      cclose
+    endif
+  endfunction
+  ]],
+}
+
+M.load = function(commands)
+  for _, command in ipairs(commands) do
+    vim.cmd(command)
+  end
+end
+
+return M