feat: allow configuring api path

Arnaud Vergnet requested to merge topic/default/path-config into branch/default

Makes it possible to configure a custom api prefix in all-in-one.conf using the api-path-prefix key.

This prefix is validated using regex to only allow latin and basic symbols.

The openapi specification is updated using this prefix to add it to each path.

Edited by Arnaud Vergnet

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