Add support for events related to church

[Ainali]

To make the timeline feature available we will need to be able to store events related to a church. The table should have at least: id for the church, event type, start time, end time. It could possibly also have description text, image which could be fetched from associated wikidata object and wikipedia article (if any).

[Abbe98]

I'm considering doing this in just another column and have it stored in JSON there as we would probably want to load all events for a church at the same time anyway(and SQLite is quite slow).

[Ainali]

So you would rather have multiple lines for each church in the main table? Hopefully, later on, we can have more than 20 events for each church.

[Abbe98]

I would introduce a new events column and add pregenerated JSON there representing all the events for the specific church.