Add Freezer SC wrapper

Author: VadimGrznk

sdk/contracts/Freezer.py

@@ -0,0 +1,39 @@
+import sys
+
+from sdk.contracts.base_wrapper import BaseWrapper
+from sdk.registry import Registry
+
+from web3 import Web3
+
+
+# TODO: test when other called SC wrappers will be written and callable
+class Freezer(BaseWrapper):
+    """
+    Attributes:
+        web3: Web3
+            Web3 object
+        registry: Registry
+            Registry object
+        address: str
+            Contract's address
+        abi: list
+            Contract's ABI
+        wallet: Wallet
+            Wallet object to sign transactions
+    """
+
+    def __init__(self, web3: Web3, registry: Registry, address: str, abi: list, wallet: 'Wallet' = None):
+        super().__init__(web3, registry, wallet=wallet)
+        self.web3 = web3
+        self.address = address
+        self._contract = self.web3.eth.contract(self.address, abi=abi)
+        self.__wallet = wallet
+
+    def freeze(self, target: str):
+        return self._contract.functions.freeze(target).call()
+    
+    def unfreeze(self, target: str):
+        return self._contract.functions.unfreeze(target).call()
+    
+    def is_frozen(self, address: str) -> bool:
+        return self._contract.functions.isFrozen(address).call()