No autocompletion for `codiceIPA`, and in general for organisations

The editor used to have autocompletion for `codiceIPA`, via an external query to Elastic, but it got lost with the new version:

https://github.com/user-attachments/assets/681f910b-a48c-4bbf-9272-836aff970482

This makes harder for the user to pick the right code or even understand what code they're supposed to use.

Note that "`it.riuso.codiceIPA`" is deprecated and superseded by `organisation.uri` in [publiccode.yml v0.5.0](https://yml.publiccode.tools/schema.core.html#key-organisation-uri), which harmonizes the concept to non Italian PAs, so this can be a chance to think about some sort of generic autocompletion for EU administrations.