[quicwg/base-drafts] introduce an error code for loss recovery-related errors (#2319)

[Marten Seemann <[e-mail]>]

As discussed in https://github.com/quicwg/base-drafts/pull/2302#discussion_r245545039, I'd like to advocate for introducing a new error code for loss recovery-related errors, e.g. when an unsent packet (in a respective packet number space) is acknowledged.

In general, we have transport error codes to describe the area where an error occurred. For example, we have a STREAM_STATE_ERROR, which is used when the peer sends frames for the wrong stream type or unopened stream types. And we have a FLOW_CONTROL_ERROR, for, obviously, flow-control related errors.

Generating ACKs for multiple packet number spaces is not a trivial thing to do, and it would be of great help for debugging to have a more specific error here than the catch-all PROTOCOL_VIOLATION.

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