Lua: load module pandoc.path on startup

Previously the module always had to be loaded via
`require 'pandoc.path'`.

Closes: #7524

data/pandoc.lua

@@ -27,6 +27,7 @@ local M = {}
 -- Re-export bundled modules
 M.List = require 'pandoc.List'
 M.mediabag = require 'pandoc.mediabag'
+M.path = require 'pandoc.path'
 M.system = require 'pandoc.system'
 M.types = require 'pandoc.types'
 M.utils = require 'pandoc.utils'