feat: Add option to draw shadow behind toasts

[woelper]

This PR exposes the option to use a shadow on notifications in order to improve visibility. The shadow is optional.

[bircni]

Maybe also extend the examples to show the shadow

[woelper]

Maybe also extend the examples to show the shadow

I added a button to add shadows. Hope this works for you!

[bircni]

Could not spot any difference
with shadow:

without shadow:

[bircni]

I suggest changing the examples like this:
all.rs.txt

[woelper]

I suggest changing the examples like this: all.rs.txt

Done!

[ItsEthra]

Also it says there are conflicts? you may need to rebase. and could you add a line to changelog I just created.

[woelper]

I have no idea how to resolve the conflicts in the fork to be honest... what I see from the gh tool and the web interface is not really helpful

[woelper]

I think I got it done using the web editor.

[ItsEthra]

Thanks