Apicurio Studio - Now with OpenAPI Vendor Extensions

The Apicurio Studio OpenAPI editor has been around for a long time, and over time support for vendor extensions has evolved somewhat. It started with: “You can use the Source tab, good luck!” Eventually we added a Vendor Extension section in various places, which made things a bit better. However, the UI was rather basic - just a list of the extensions with values displayed as raw JSON.