Improvements for part creation API endpoint (#4281)

* Refactor javascript for creating a new part

* Simplify method of removing create fields from serializer

* Fix bug which resulted in multiple model instances being created

* remove custom code required on Part model

* Reorganize existing Part API test code

* Add child serializer for part duplication options

* Part duplication is now handled by the DRF serializer

- Improved validation options
- API is self-documenting (no more secret fields)
- More DRY

* Initial stock is now handled by the DRF serializer

* Adds child serializer for adding initial supplier data for a Part instance

* Create initial supplier and manufacturer parts as specified

* Adding unit tests

* Add unit tests for part duplication via API

* Bump API version

* Add javascript for automatically extracting info for nested fields

* Improvements for part creation form rendering

- Move to nested fields (using API metadata)
- Visual improvements
- Improve some field name / description values

* Properly format nested fields for sending to the server

* Handle error case for scrollIntoView

* Display errors for nested fields

* Fix bug for filling part category

* JS linting fixes

* Unit test fixes

* Fixes for unit tests

* Further fixes to unit tests

InvenTree/common/models.py

@@ -1121,12 +1121,19 @@ class InvenTreeSetting(BaseInvenTreeSetting):
         },
 
         'PART_CREATE_INITIAL': {
-            'name': _('Create initial stock'),
-            'description': _('Create initial stock on part creation'),
+            'name': _('Initial Stock Data'),
+            'description': _('Allow creation of initial stock when adding a new part'),
             'default': False,
             'validator': bool,
         },
 
+        'PART_CREATE_SUPPLIER': {
+            'name': _('Initial Supplier Data'),
+            'description': _('Allow creation of initial supplier data when adding a new part'),
+            'default': True,
+            'validator': bool,
+        },
+
         'PART_NAME_FORMAT': {
             'name': _('Part Name Display Format'),
             'description': _('Format to display the part name'),