Prompt for filename after dragging an image into a note

Feature requests
15

I would say two options are needed:

  1. a template for auto image name generation like:
    [hash].[extension] : ![](3307D18160AB7426B67FE200F12D664C.jpg)
    or
    [timestamp].[extension] : ![](2020210523144725.jpg) (this is similar to v0.12.3)
    or
    [relative_path]/[timestamp].[extension] : attachments/2020210523144725.jpg

  2. a prompt or auto focus to rename the file.