## What changed?
Move converting `time.Time` values for `Datetime` type search attributes
to the DB plugin code.
## Why?
This gives more flexibility for the plugin implementation to deal with
it as needed.
## How did you test it?
- [x] built
- [ ] run locally and tested manually
- [x] covered by existing tests
- [ ] added new unit test(s)
- [ ] added new functional test(s)
## Potential risks