Search with dates

[marien-probesys]

Follow-up of https://github.com/Probesys/bileto/issues/7

I didn't implement search based on dates because it's a bit more work.

At least two qualifiers should be added: created: and updated:. I’d like to support ISO 8601 time intervals format (http://en.wikipedia.org/wiki/ISO_8601#Time_intervals), but also some shortcuts (e.g. today), or comparisons (e.g. >=2023-04-25)

updated: qualifier depends on https://github.com/Probesys/bileto/issues/240