Svelte NodeToolbar with E2E (#3643)

* Added NodeToolbar

* Added comments & fixed default behaviour in svelte

* Added e2e-tests for NodeToolbar component & added data-id to react NodeToolbar

* refactor(svelte/NodeToolbar): cleanup

* refactor(node-toolbar): add system utils

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Co-authored-by: moklick <info@moritzklack.com>

packages/system/src/utils/index.ts

@@ -3,4 +3,5 @@ export * from './edges';
 export * from './graph';
 export * from './general';
 export * from './marker';
+export * from './node-toolbar';
 export * from './store';