Add option to start radio after playing a song

[Wahat]

Is your feature request related to a problem? Please describe.
After playing a song with the play command with nothing in queue, the discord channel the bot was playing is filled with awkward silence

Describe the solution you'd like
I would like to have the option to start a spotify radio after my requested song is played to fill in this void.

Describe context of feature
Add an option to start a spotify radio in the play command
ex. -play blackpink lovesick girls -radio

Additional context
u mam