Allow multiline queries

[Akron]

I think we discussed this when establishing ANNIS, but it may be more relevant for things like natural language queries in the future (i.e. AI integration) - this should at least be taken into account when changing the UI design.

For AI integration I would think we allow users to write a question like Ich suche Nomen, die nach dem Adjektiv 'alter' kommen. Sortiere sie nach Vorkommenshäufigkeit. or something similar. The question should be prefixed with a document describing all language features of either KoralQuery or a QL supported by KorAP. The AI should simply draft a query, that will then be shown to the user with comments on what these query fragments mean in regard to the original question - and for that I would say we need multiline query inputs. The query then can be send to the backend (no AI involved).