add hexdump util

hexdump.py

@@ -0,0 +1,15 @@
+
+
+# https://stackoverflow.com/a/79038702
+def hexdump(data: bytes):
+    def to_printable_ascii(byte):
+        return chr(byte) if 32 <= byte <= 126 else "."
+
+    offset = 0
+    while offset < len(data):
+        chunk = data[offset : offset + 16]
+        hex_values = " ".join(f"{byte:02x}" for byte in chunk)
+        ascii_values = "".join(to_printable_ascii(byte) for byte in chunk)
+        print(f"{offset:08x}  {hex_values:<48}  |{ascii_values}|")
+        offset += 16
+