pyln.proto.message: export more.

FieldType lets you make new field types, and split_field helps with
parsing.

Signed-off-by: Rusty Russell <[email protected]>

Author: rustyrussell

contrib/pyln-proto/pyln/proto/message/__init__.py

@@ -1,4 +1,5 @@
 from .message import MessageNamespace, MessageType, Message, SubtypeType
+from .fundamental_types import split_field, FieldType
 
 __version__ = '0.0.1'
 
@@ -7,4 +8,6 @@
     "MessageType",
     "Message",
     "SubtypeType",
+    "FieldType",
+    "split_field",
 ]