update ergonomics for voice api

[ad12]

• keeps a cache of voices on the client side that is synced with the voices on supabase - includes both public and user specific voices
• currently cloning does not save the voices to supabase on the server side. so we updated python api to also not save these voices. in the future we will add save query param that allows the user to save the voice on the client side

here is an image of the different usage patterns:

[linear[bot]]

CAR-337 Update Python client to be more ergonomic for voices