Add 'Tag' management (#4367)

* 'Tag' management
Fixes #83

* Add for ManufacturerPart, SupplierPart

* Add tags for StockLocation, StockItem

* fix serializer definition

* add migrations

* update pre-commit

* bump dependencies

* revert updates

* set version for bugbear

* remove bugbear

* readd bugbear remove isort

* and remove bugbear again

* remove bugbear

* make tag fields not required

* add ruleset

* Merge migrations

* fix migrations

* add unittest for detail

* test tag add

* order api

* reduce database access

* add tag modification test

* use overriden serializer to ensuer the manager is always available

* fix typo

* fix serializer

* increae query thershold by 1

* move tag serializer

* fix migrations

* content_types are changing between tests - removing them

* remove unneeded fixture

* Add basic docs

* bump API version

* add api access to the docs

* add python code

* Add tags to search and filters for all models

InvenTree/part/test_api.py

@@ -1425,6 +1425,7 @@ class PartDetailTests(PartAPITestBase):
                 'name': 'my test api part',
                 'description': 'a part created with the API',
                 'category': 1,
+                'tags': '["tag1", "tag2"]',
             }
         )
 
@@ -1438,6 +1439,8 @@ class PartDetailTests(PartAPITestBase):
         part = Part.objects.get(pk=pk)
 
         self.assertEqual(part.name, 'my test api part')
+        self.assertEqual(part.tags.count(), 2)
+        self.assertEqual([a.name for a in part.tags.order_by('slug')], ['tag1', 'tag2'])
 
         # Edit the part
         url = reverse('api-part-detail', kwargs={'pk': pk})
@@ -1468,6 +1471,13 @@ class PartDetailTests(PartAPITestBase):
 
         self.assertEqual(response.status_code, 200)
 
+        # Try to remove a tag
+        response = self.patch(url, {
+            'tags': ['tag1',],
+        })
+        self.assertEqual(response.status_code, 200)
+        self.assertEqual(response.data['tags'], ['tag1'])
+
         # Try to remove the part
         response = self.delete(url)