Replace specific events with a single encompassing event

[rmarx]

We want to reduce the total amount of events as much as possible.

Especially specific events for things happening in reaction to the receipt of a specific frame in a packet (e.g., ACK, MAX_DATA, etc.) can be removed, since they can usually be inferred from that frame. Initially we had separate events for these (e.g., "packet_acknowledged" or "flow_control_updated" but those were rarely used in addition to packet_received events + many implementations do not defer frame handling from reception.

One notable exception is @nibank's msquic, which does not log all frames in a received packet, but rather does log only specific events (e.g., packet_acknowledged). One of the reasons is because he feels logging each packet in full does not scale. Another reason for this pattern might be that an implementation does not wish to log all types of frames OR conversely, does not want to log packet-level information at all but only very select frames.

To support this use case and still keep a low amount of event types, I will add a "frame_parsed" encompassing event. This will log the frame with its associated data, but without the encompassing packet-level data. This prevents re-defining semantics for many events. The downside is that you sometimes might want to log e.g., "packet_acknowledged" a long time after frame receipt. In that case, you would pretend you're parsing the frame only then. I feel this is a good trade-off to make here though.