[Assets][Tree] Add new attributes to tree endpoint

[lukmzig]

Changes in this pull request

Part of

• https://github.com/pimcore/studio-ui-bundle/issues/68
• https://github.com/pimcore/studio-ui-bundle/issues/69
• https://github.com/pimcore/studio-ui-bundle/issues/72

Additional info

Renamed collection endpoint to tree endpoint Added additional parameters to pre-response event so users can adapt styling in the tree

[sonarcloud[bot]]

Quality Gate passed

Issues
0 New issues
2 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarCloud