audio: Make sure to stop ringbuffer on error

audio: Make sure to stop ringbuffer on error

Add gst_audio_ring_buffer_set_errored() that will mark the
ringbuffer as errored only if it is currently started or paused,
so gst_audio_ringbuffer_stop() can be sure that the error
state means that the ringbuffer was started and needs stop called.

Fixes a crash with osxaudiosrc if the source element posts
an error, because the ringbuffer would not get stopped and CoreAudio
would continue trying to do callbacks.

Also, anywhere that modifies the ringbuffer state, make sure to
use atomic operations, to guarantee their visibility

Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/5216>