rgw/lua: Update background thread to handle config changes

rgw/lua: Update background thread to handle config changes

Ensure Lua background thread updates memory and runtime limits when config changes.
- Added setters/getters for max memory and runtime limits in lua_state_guard.
- Implemented dynamic updates for memory and runtime limits in the background thread.
- Reset Lua state when memory limit require restart.
- Added a memory leak check after Lua cleanup to ensure proper resource deallocation.

Signed-off-by: Oshry Avraham <oshry.dev@gmail.com>