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>

src/frontend/lib/enums/ApiEndpoints.tsx

@@ -220,6 +220,9 @@ export enum ApiEndpoints {
 
   // Special plugin endpoints
   plugin_locate_item = 'locate/',
+  plugin_supplier_list = 'supplier/list/',
+  plugin_supplier_search = 'supplier/search/',
+  plugin_supplier_import = 'supplier/import/',
 
   // Machine API endpoints
   machine_types_list = 'machine/types/',