chore: fix linting issues

Author: b00f

examples/example_key_generation.py

@@ -1,12 +1,8 @@
 import argparse
 
-from pactus.crypto.hrp import HRP
-from pactus.crypto.address import AddressType
+from pactus.crypto import Address, AddressType, HRP, PrivateKey, PublicKey
 from pactus.crypto.bls import PrivateKey as BLSPrivateKey
 from pactus.crypto.ed25519 import PrivateKey as Ed25519PrivateKey
-from pactus.crypto import PrivateKey
-from pactus.crypto import PublicKey
-from pactus.crypto.address import Address
 
 
 def main() -> None:

pactus/crypto/__init__.py

@@ -1,4 +1,6 @@
 from .address import Address, AddressType
 from .hrp import HRP
+from .private_key import PrivateKey
+from .public_key import PublicKey
 
-__all__ = ["HRP", "Address", "AddressType"]
+__all__ = ["HRP", "Address", "AddressType", "PrivateKey", "PublicKey"]