[#3] Added generate proto script create container method

Signed-off-by: Ilyas Niyazov <i.niyazov@yadro.com>

frostfs_sdk/cryptography/key_extension.py

@@ -42,3 +42,11 @@ class KeyExtension:
         if len(sequence_symbols) == 0 or sequence_symbols is None:
             raise ValueError(f"Empty sequence symbols of key: {sequence_symbols}")
         return False
+    
+    @staticmethod
+    def get_hex_string(value):
+        if value is None or len(value) == 0:
+            raise ValueError("Input parameter is missing")
+
+        # Convert byte array to hexadecimal string
+        return f"{int.from_bytes(value, byteorder='big'):0{len(value) * 2}x}"