test: Drop .parser from imports

test_cfl_cfg.py

 from lib.common import Nonterminal, Terminal, Eps
-from lib.parsing.parser import Parser
+from lib.parsing import Parser
 import lib.cfl as cfl
 from copy import deepcopy
 

test_reg.py

-from lib.parsing.parser import Parser
+from lib.parsing import Parser
 from lib.dfa import DFA
 
 def is_can(dfa: str) -> bool: