fix proof field forging for reveal

A proof field has been introduced in the protocol Seoul.
Its encoding is described here: https://gitlab.com/tezos/tezos/-/blob/octez-v23.0/src/proto_023_PtSeouLo/lib_protocol/operation_repr.ml#L686

If proof is required:
 - A `ff` tag (True) need to be added in the same way as the `00`
 tag (False) is added if proof is absent.
 - A 4-bytes size representing the size of the proof is need.

Author: spalmer25

src/pytezos/operation/forge.py

@@ -95,7 +95,13 @@ def forge_reveal(content: Dict[str, Any]) -> bytes:
     res += forge_nat(int(content['gas_limit']))
     res += forge_nat(int(content['storage_limit']))
     res += forge_public_key(content['public_key'])
-    res += forge_bool(False) if 'proof' not in content else forge_base58(content['proof'])
+
+    if  'proof' in content:
+        res += forge_bool(True)
+        res += forge_array(forge_base58(content['proof']))
+    else:
+        res += forge_bool(False)
+
     return res