Supplier Mixin (#9761)

* commit initial draft for supplier import

* complete import wizard

* allow importing only mp and sp

* improved sample supplier plugin

* add docs

* add tests

* bump api version

* fix schema docu

* fix issues from code review

* commit unstaged changes

* fix test

* refactor part parameter bulk creation

* try to fix test

* fix tests

* fix test for mysql

* fix test

* support multiple suppliers by a single plugin

* hide import button if there is no supplier import plugin

* make form submitable via enter

* add pui test

* try to prevent race condition

* refactor api calls in pui tests

* try to fix tests again?

* fix tests

* trigger: ci

* update changelog

* fix api_version

* fix style

* Update CHANGELOG.md

Co-authored-by: Matthias Mair <code@mjmair.com>

* add user docs

---------

Co-authored-by: Matthias Mair <code@mjmair.com>

CHANGELOG.md

@@ -10,6 +10,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 ### Added
 
 - Added `order_queryset` report helper function in [#10439](https://github.com/inventree/InvenTree/pull/10439)
+- Added `SupplierMixin` to import data from suppliers in [#9761](https://github.com/inventree/InvenTree/pull/9761)
 - Added much more detailed status information for machines to the API endpoint (including backend and frontend changes) in [#10381](https://github.com/inventree/InvenTree/pull/10381)
 - Added ability to partially complete and partially scrap build outputs in [#10499](https://github.com/inventree/InvenTree/pull/10499)
 - Added support for Redis ACL user-based authentication in [#10551](https://github.com/inventree/InvenTree/pull/10551)