Add support for WEBP or PNG with transparency to Tiles image helpers about horologist

[yschimke]

cc @ataulm

[yschimke]

We should make this a flag, useRgb565?

Current logic when useRgb565.

When not useRgb565, remove setFormat, and pass through the existing bytes. Tile rendering should ask the system to decode.

Samples should show a png, webp or jpg working without conversion.

[ataulm]

I think for a "good first issue" this needs more context:

• what's the problem and which APIs does this affect currently?
• Are we talking only about this function? Or will further changes need to be made elsewhere?
• is this something that we can do without exposing a flag/new API? e.g. detect the type of the image and convert it with the correct compression?
• are there similar APIs in well-established libraries like Coil, Glide and Picasso that we should follow?