[Feature] Stocktake reports (#4345)

* Add settings to control upcoming stocktake features

* Adds migration for "cost range" when performing stocktake

* Add cost data to PartStocktakeSerializer

Implement a new custom serializer for currency data type

* Refactor existing currency serializers

* Update stocktake table and forms

* Prevent trailing zeroes in forms

* Calculate cost range when adding manual stocktake entry

* Display interactive chart for part stocktake history

* Ensure chart data are converted to common currency

* Adds new model for building stocktake reports

* Add admin integration for new model

* Adds API endpoint to expose list of stocktake reports available for download

- No ability to edit or delete via API

* Add setting to control automated deletion of old stocktake reports

* Updates for settings page

- Load part stocktake report table
- Refactor function to render a downloadable media file
- Fix bug with forcing files to be downloaded
- Split js code into separate templates
- Make use of onPanelLoad functionalitty

* Fix conflicting migration files

* Adds API endpoint for manual generation of stocktake report

* Offload task to generate new stocktake report

* Adds python function to perform stocktake on a single part instance

* Small bug fixes

* Various tweaks

- Prevent new stocktake models from triggering plugin events when created
- Construct a simple csv dataset

* Generate new report

* Updates for report generation

- Prefetch related data
- Add extra columns
- Keep track of stocktake instances (for saving to database later on)

* Updates:

- Add confirmation message
- Serializer validation checks

* Ensure that background worker is running before manually scheduling a new stocktake report

* Add extra fields to stocktake models

Also move code from part/models.py to part/tasks.py

* Add 'part_count' to PartStocktakeReport table

* Updates for stocktake generation

- remove old performStocktake javascript code
- Now handled by automated server-side calculation
- Generate report for a single part

* Add a new "role" for stocktake

- Allows fine-grained control on viewing / creating / deleting stocktake data
- More in-line with existing permission controls
- Remove STOCKTAKE_OWNER setting

* Add serializer field to limit stocktake report to particular locations

* Use location restriction when generating a stocktake report

* Add UI buttons to perform stocktake for a whole category tree

* Add button to perform stocktake report for a location tree

* Adds a background tasks to handle periodic generation of stocktake reports

- Reports are generated at fixed intervals
- Deletes old reports after certain number of days

* Implement notifications for new stocktake reports

- If manually requested by a user, notify that user
- Cleanup notification table
- Amend PartStocktakeModel for better notification rendering

* Hide buttons on location and category page if stocktake is not enabled

* Cleanup log messages during server start

* Extend functionality of RoleRequired permission mixin

- Allow 'role_required' attribute to be added to an API view
- Useful when using a serializer class that does not have a model defined

* Add boolean option to toggle whether a report will be generated

* Update generateStocktake function

* Improve location filtering

- Don't limit the actual stock items
- Instead, select only parts which exist within a given location tree

* Update API version

* String tweaks

* Fix permissions for PartStocktake API

* More unit testing for stocktake functionality

* QoL fix

* Fix for assigning inherited permissions

InvenTree/order/serializers.py

@@ -17,10 +17,10 @@ import order.models
 import part.filters
 import stock.models
 import stock.serializers
-from common.settings import currency_code_mappings
 from company.serializers import CompanyBriefSerializer, SupplierPartSerializer
 from InvenTree.helpers import extract_serial_numbers, normalize, str2bool
 from InvenTree.serializers import (InvenTreeAttachmentSerializer,
+                                   InvenTreeCurrencySerializer,
                                    InvenTreeDecimalField,
                                    InvenTreeModelSerializer,
                                    InvenTreeMoneySerializer)
@@ -58,10 +58,7 @@ class AbstractExtraLineSerializer(serializers.Serializer):
         allow_null=True
     )
 
-    price_currency = serializers.ChoiceField(
-        choices=currency_code_mappings(),
-        help_text=_('Price currency'),
-    )
+    price_currency = InvenTreeCurrencySerializer()
 
 
 class AbstractExtraLineMeta:
@@ -316,16 +313,11 @@ class PurchaseOrderLineItemSerializer(InvenTreeModelSerializer):
 
     supplier_part_detail = SupplierPartSerializer(source='part', many=False, read_only=True)
 
-    purchase_price = InvenTreeMoneySerializer(
-        allow_null=True
-    )
+    purchase_price = InvenTreeMoneySerializer(allow_null=True)
 
     destination_detail = stock.serializers.LocationBriefSerializer(source='get_destination', read_only=True)
 
-    purchase_price_currency = serializers.ChoiceField(
-        choices=currency_code_mappings(),
-        help_text=_('Purchase price currency'),
-    )
+    purchase_price_currency = InvenTreeCurrencySerializer(help_text=_('Purchase price currency'))
 
     order_detail = PurchaseOrderSerializer(source='order', read_only=True, many=False)
 
@@ -879,14 +871,9 @@ class SalesOrderLineItemSerializer(InvenTreeModelSerializer):
 
     shipped = InvenTreeDecimalField(read_only=True)
 
-    sale_price = InvenTreeMoneySerializer(
-        allow_null=True
-    )
+    sale_price = InvenTreeMoneySerializer(allow_null=True)
 
-    sale_price_currency = serializers.ChoiceField(
-        choices=currency_code_mappings(),
-        help_text=_('Sale price currency'),
-    )
+    sale_price_currency = InvenTreeCurrencySerializer(help_text=_('Sale price currency'))
 
     class Meta:
         """Metaclass options."""