Make get_public_url sync

[masylum]

What kind of change does this PR introduce?

Simplify get_public_url signature by removing async

What is the current behavior?

It's async

What is the new behavior?

It's not async

Additional context

There is no need to since there is nothing to await. It makes the consumers more complicated and it looks like it will have a side effect which it does not.

[J0]

Hey @masylum!

Thanks for the PR! If it helps there's actually a corresponding sync version of the method on the Sync client

[silentworks]

We ship both sync and async version of this library. If you need the sync version you should import that instead, if you are using this through supabase-py then by default it exports the sync version.

[masylum]

I'm aware of the both versions, it's just that it does not make much sense for this method to be async since there is no await in the body. This just improves the API by making explicit that this does actually not have any I/O, it's a pure function.