Log filters are not respected by the API

[Senyoret1]

Describe the bug
Calling the GET /api/visors/{pk}/apps/skychat/logs?since=2022-12-14T12:00:00 does not return the log entries starting from 2022-12-14, it returns all the log entries, which could include data from years ago.

Expected behavior
It should return the log entries created on 2022-12-14T12:00:00 and later, all previous entries should be ignored. However, maybe we should define the exact format that should be used for sending the data with the since param.

[0pcom]

solved in #1507