Fix circular imports

Because:
- They were causing errors in the cli

nucypher/blockchain/eth/decorators.py

@@ -1,19 +1,20 @@
 
 
-import eth_utils
 import functools
 import inspect
+from datetime import datetime
+from typing import Callable, Optional, TypeVar, Union
+
+import eth_utils
 from constant_sorrow.constants import (
     CONTRACT_ATTRIBUTE,
     CONTRACT_CALL,
+    NO_BLOCKCHAIN_CONNECTION,
     TRANSACTION,
     UNKNOWN_CONTRACT_INTERFACE,
-    NO_BLOCKCHAIN_CONNECTION
 )
-from datetime import datetime
-from typing import Callable, Optional, Union
+from web3.types import TxReceipt, Wei
 
-from nucypher.types import ContractReturnValue
 from nucypher.utilities.logging import Logger
 
 ContractInterfaces = Union[
@@ -22,6 +23,9 @@ ContractInterfaces = Union[
     CONTRACT_ATTRIBUTE,
     UNKNOWN_CONTRACT_INTERFACE
 ]
+ContractReturnValue = TypeVar(
+    "ContractReturnValue", bound=Union[TxReceipt, Wei, int, str, bool]
+)
 
 
 __VERIFIED_ADDRESSES = set()

nucypher/blockchain/eth/trackers/dkg.py

@@ -6,7 +6,7 @@ from twisted.internet import threads
 from web3.contract.contract import ContractEvent
 from web3.datastructures import AttributeDict
 
-from nucypher.blockchain.eth.actors import Ritualist
+from nucypher.blockchain.eth import actors
 from nucypher.policy.conditions.utils import camel_case_to_snake
 from nucypher.utilities.events import EventScanner, JSONifiedState
 from nucypher.utilities.logging import Logger
@@ -67,7 +67,7 @@ class ActiveRitualTracker:
 
     def __init__(
         self,
-        ritualist: Ritualist,
+        ritualist: "actors.Ritualist",
         persistent: bool = False,  # TODO: use persistent storage?
     ):
         self.log = Logger("RitualTracker")

nucypher/types.py

@@ -1,7 +1,7 @@
-from typing import NamedTuple, NewType, TypeVar, Union
+from typing import NamedTuple, NewType, TypeVar
 
 from eth_typing.evm import ChecksumAddress
-from web3.types import TxReceipt, Wei
+from web3.types import Wei
 
 from nucypher.blockchain.eth import agents
 
@@ -10,9 +10,6 @@ NuNits = NewType("NuNits", ERC20UNits)
 TuNits = NewType("TuNits", ERC20UNits)
 
 Agent = TypeVar("Agent", bound="agents.EthereumContractAgent")
-ContractReturnValue = TypeVar(
-    "ContractReturnValue", bound=Union[TxReceipt, Wei, int, str, bool]
-)
 
 
 class StakingProviderInfo(NamedTuple):