Add `Script.GetName()` to LuaParser

See title. The function exists in other Lua envs. Ideally this would include the file being parsed (e.g. `LuaParser: resources.lua`) but even just returning `LuaParser` would be an improvement.

Locate LuaParser and inspect how Script methods are exposed, then look for the existing GetName implementation in the other Lua environments mentioned by the issue. Confirm the parser name is returned, preferably with the parsed filename, and verify the behavior through the relevant Lua scripting tests if present.

Written by the indexing model from the issue text.