Export image_signature in kha256 module

Added image_signature to the list of exported functions.

Author: WhiteSymmetry

kha256/__init__.py

@@ -127,6 +127,7 @@
     generate_compact_hwid,
     generate_secure_hwid,
     simple_hmac,
+    image_signature,
 )
 
 # Testing and benchmarking functions
@@ -318,6 +319,7 @@
     "verify_password",
     "batch_hash_secure",
     "batch_hash_xxh64",
+    "image_signature",
 
     # Quick hash functions
     "quick_hash",