Add UI to set a named URL or fixed port to an installed extension

[rafaellehmkuhl]

This would be very helpful. It would allow users to easily have a fixed address that they can use for integrations.

[github-actions]

Yo, this issue might be related to:

• Extensions should be able to configure nginx configuration #3862: same goal of allowing extensions to configure networking (nginx configuration)
• Extensions should be able to configure avahi #3861: similar networking customization need (extension creating custom .local links via avahi)