8927 plugin search (#10489)

* #7016 base search classes

* 7016 add search indexes

* 7016 add search indexes

* 7016 add search indexes

* 7016 add search indexes

* 7016 add search indexes

* 7016 add search indexes

* 8927 refactor search

* 8927 refactor search

* 8927 refactor search

* 8927 refactor search

* 8927 get search choices working

* 8927 cleanup - optimize

* 8927 use backend search function

* 8927 fix for plugin search

* 8927 add docs

* Move search app to a module under netbox/

* Utilize global registry to register model search classes

* Build search form options from registry

* Determine search categories from model app by default

* Enable dynamic search registration for plugins

* Update docs & improve plugin support

* Clean up search backend class

* Docs for #8927

Co-authored-by: jeremystretch <jstretch@ns1.com>

netbox/extras/search.py

@@ -0,0 +1,14 @@
+import extras.filtersets
+import extras.tables
+from extras.models import JournalEntry
+from netbox.search import SearchIndex, register_search
+
+
+@register_search()
+class JournalEntryIndex(SearchIndex):
+    model = JournalEntry
+    queryset = JournalEntry.objects.prefetch_related('assigned_object', 'created_by')
+    filterset = extras.filtersets.JournalEntryFilterSet
+    table = extras.tables.JournalEntryTable
+    url = 'extras:journalentry_list'
+    category = 'Journal'