refactor(scripts): move Opcode and functions to their own file

Author: glevco

hathor/transaction/script/hathor_script.py

@@ -15,7 +15,7 @@
 import struct
 from typing import Union
 
-from hathor.transaction.script.scripts import Opcode
+from hathor.transaction.script.opcode import Opcode
 
 
 class HathorScript:

hathor/transaction/script/multi_sig.py

@@ -18,8 +18,8 @@
 from hathor.crypto.util import decode_address, get_address_b58_from_redeem_script_hash
 from hathor.transaction.script.base_script import BaseScript
 from hathor.transaction.script.hathor_script import HathorScript
-from hathor.transaction.script.scripts import re_compile, get_script_op, Opcode, get_pushdata, Stack, op_pushdata, \
-    op_pushdata1
+from hathor.transaction.script.scripts import re_compile, get_script_op, get_pushdata, Stack
+from hathor.transaction.script.opcode import Opcode, op_pushdata, op_pushdata1
 
 
 class MultiSig(BaseScript):

hathor/transaction/script/nano_contract_match_values.py

@@ -18,7 +18,9 @@
 
 from hathor.crypto.util import get_address_b58_from_bytes
 from hathor.transaction.script.hathor_script import HathorScript
-from hathor.transaction.script.scripts import re_compile, Opcode, get_pushdata, binary_to_int
+from hathor.transaction.script.scripts import re_compile, get_pushdata, binary_to_int
+from hathor.transaction.script.opcode import Opcode
+
 
 # XXX: does it make sense to make this BaseScript too?
 class NanoContractMatchValues: