Isfdb ID for books and authors (#2482)

* New ID: Audible ASIN

Audible belongs to Amazon BUT they do not share the same IDs. The Audible ASIN of an audiobook is never the same as the Amazon ASIN.

Yeah, I know, Amazon is great. The fact that the ASIN is a good distinction for different works and editions bothers me more than I will ever be willing to admint.

* New ID "ISFDB"

Internet Speculative Ficiton Database ID for books and authors.
Links to the entry if set.

* Added aasin to test

Added aasin to test

* the answer expects more emptxy fields...

bookwyrm/forms/author.py

@@ -21,6 +21,7 @@ class AuthorForm(CustomForm):
             "inventaire_id",
             "librarything_key",
             "goodreads_key",
+            "isfdb",
             "isni",
         ]
         widgets = {

bookwyrm/forms/books.py

@@ -89,6 +89,8 @@ class EditionForm(CustomForm):
                 attrs={"aria-describedby": "desc_oclc_number"}
             ),
             "ASIN": forms.TextInput(attrs={"aria-describedby": "desc_ASIN"}),
+            "AASIN": forms.TextInput(attrs={"aria-describedby": "desc_AASIN"}),
+            "isfdb": forms.TextInput(attrs={"aria-describedby": "desc_isfdb"}),
         }