No way to set activity timestamps

[TheSecondReal0]

There is no way to set timestamps when creating an Activity (unless I'm just not seeing it, but from combing through the cpp implementation it doesn't seem to be there)

[samsface]

I've added activity time stamps. Though testing myself I can only seem to make the set_end time stamp do anything. If you know a way to test set_start is working let me know 🙏 .