fix: fix CRUD types returns and reduce DB queries when cleanup statuses

[bolinocroustibat]

1. We have some consistency issues with types and (non-blocking) type errors in the code. To make the code more consistent and avoid type warnings, we suggest the following rules:

   • In the business logic, checks should be handled as dict rather than Record whenever possible, since working with native Python objects greatly simplifies the manipulation logic.

   • Since asyncpg returns Record objects when querying the DB, CRUD methods should return Record types whenever possible so they remain “pure” CRUD.

This PR updates the code to follow these rules, and introduces a dict option to Check CRUD methods avoid repeating the pattern record = await Check.get() followed by check = dict(record) multiple times, in line with the DRY principle.

We also add # type: ignore when calling Check class methods using as_dict, as the IDE may not infer the type correctly for methods that can return multiple types.

2. Reduce DB queries when cleaning up statuses in Resource.clean_up_statuses() by using a single DB request instead of a loop.

[maudetes]

I did not look a the code in details, but it seems to me that we're adding some complexity here when the for a less structured type?