feat(bindings): Add UserSignature and dependent type impls

bindings/python/test.py

@@ -1,12 +1,12 @@
-from lib.iota_sdk_ffi import GraphQlClient, PaginationFilter, Address, Direction, TransactionsFilter, ObjectId, EventFilter
+from lib.iota_sdk_ffi import GraphQlClient, PaginationFilter, Address, Direction, TransactionsFilter, ObjectId, EventFilter, TransactionDigest
 import asyncio
 
 async def main():
     client = GraphQlClient.new_devnet()
     chain_id = await client.chain_id()
     print(chain_id)
 
-    my_address=Address.from_hex("0xb14f13f5343641e5b52d144fd6f106a7058efe2f1ad44598df5cda73acf0101f")
+    my_address = Address.from_hex("0xb14f13f5343641e5b52d144fd6f106a7058efe2f1ad44598df5cda73acf0101f")
 
     coins = await client.coins(
         my_address, 
@@ -19,9 +19,16 @@ async def main():
 
     print(f'Total Balance = {balance}')
 
-    filter=TransactionsFilter(at_checkpoint=3, input_object=ObjectId.from_hex("0xb14f13f5343641e5b52d144fd6f106a7058efe2f1ad44598df5cda73acf0101f"))
+    filter = TransactionsFilter(at_checkpoint=3, input_object=ObjectId.from_hex("0xb14f13f5343641e5b52d144fd6f106a7058efe2f1ad44598df5cda73acf0101f"))
 
-    filter=EventFilter(sender=my_address)
+    filter = EventFilter(sender=my_address)
+
+    txn = await client.transaction(TransactionDigest.from_base58("HT1wvebXV4LUisLa4aJQEyoxt1HEMqznjf5UtStmdxyM"))
+
+    if txn is not None:
+        for sig in txn.signatures():
+            print("Scheme: ", sig.scheme(), sig.scheme().value)
+        print(txn.transaction().sender().to_hex())
 
 
 if __name__ == '__main__':