MINOR: quic: Add recovery related information to "show quic"

MINOR: quic: Add recovery related information to "show quic"

Add ->srtt, ->rtt_var, ->rtt_min and ->pto_count values from ->path->loss
struct to "show quic". Same thing for ->cwnd from ->path struct.

Also take the opportunity of this patch to dump the packet number
space information directly from ->pktns[] array in place of ->els[]
array. Indeed, ->els[QUIC_TLS_ENC_LEVEL_EARLY_DATA] and ->els[QUIC_TLS_ENC_LEVEL_APP]
have the same packet number space.

Must be backported to 2.7 where "show quic" implementation has alredy been
backported.