provide information about available spatial layers
for tracks with a single layer, this should be HIGH
from field: livekit.VideoQuality quality = 1;
from field: uint32 width = 2;
from field: uint32 height = 3;
target bitrate in bit per second (bps), server will measure actual
from field: uint32 bitrate = 4;
from field: uint32 ssrc = 5;
from field: int32 spatial_layer = 6;
from field: string rid = 7;
from field: uint32 repair_ssrc = 8;
from message livekit.VideoLayer
provide information about available spatial layers