`SmallVec` with length 1

https://github.com/cloudflare/quiche/blob/098664eb001c38a8370a09a4b0d99c8126320e95/qlog/src/events/quic.rs#L651

This allocates a `SmallVec` that spills on the heap when the second element is inserted, which is probably much earlier than you want. Suggest bumping this up to 8 or 16 or something (whatever number you think a good bound for the number of frames in most QUIC packets is.)

You might also want to review other uses of `SmallVec` in quiche.