Preserve Favorite/Heart upon Convert

[Saijin-Naib]

Is your feature request related to a problem? Please describe.
As in issue #1322 , I like using Aves to batch-convert JPEG/PNG/et al. to WebP on device. When this is done, attributes like date/time are lost, and Favorite status is lost as well, meaning in order to clear up space I have to Heart each converted file before removing the original.

Describe the solution you'd like
Transfer Aves-applied tags to the converted file.

Describe alternatives you've considered
Manually doing this, which is painful above a handful of images.

Additional context
Niche workflow, but as in #1322 , it would be nice.