Use remote_id resolver to load books, user

bookwyrm/activitypub/verbs.py

@@ -3,6 +3,7 @@ from dataclasses import dataclass
 from typing import List
 
 from .base_activity import ActivityObject, Signature
+from .book import Book
 
 @dataclass(init=False)
 class Verb(ActivityObject):
@@ -69,6 +70,13 @@ class Add(Verb):
     type: str = 'Add'
 
 
+@dataclass(init=False)
+class AddBook(Verb):
+    '''Add activity that's aware of the book obj '''
+    target: Book
+    type: str = 'Add'
+
+
 @dataclass(init=False)
 class Remove(Verb):
     '''Remove activity '''