Use StreamConfig instead of BufferSize

[DaforLynx]

trafficstars

~~The commit message is misleading as i, uh, tried to rebase it to squash and rename but I failed.~~

I fixed it.

[DaforLynx]

I'm not sure how to test this inside the repo, but I predict it will simply give a BuildStreamError(StreamConfigNotSupported) error if the samplerate is unsupported by the device. Behavior should be unchanged if None is passed to the backend configuration.

[DaforLynx]

@tesselode I've updated the PR per your recommendation. It now takes an optional StreamConfig instead of buffer size + sample rate.

[xMAC94x]

any update on this ? 👀