Support url-mapping property on quarkus

[faermanj]

Describe your motivation

Let quarkus projects use rest endpoints (/api/) and dev UI (/q/) by settting an context prefix to vaadin app (/app/*)

@mstahv describes the issue in detail here:
https://vaadin.com/blog/hosting-rest-endpoints-next-to-your-vaadin-ui

Describe the solution you'd like

Have vaadin.url-mapping property work on quarkus projects

Describe alternatives you've considered

Current workaround is to add undertow extension and remap the vaadin servlet

Additional context

No response