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/tests/api.ts

@@ -0,0 +1,10 @@
+import { request } from '@playwright/test';
+import { adminuser, apiUrl } from './defaults';
+
+export const createApi = () =>
+  request.newContext({
+    baseURL: apiUrl,
+    extraHTTPHeaders: {
+      Authorization: `Basic ${btoa(`${adminuser.username}:${adminuser.password}`)}`
+    }
+  });