MINOR: mux-quic: support max bidi streams value set by the peer

MINOR: mux-quic: support max bidi streams value set by the peer

Implement support for MAX_STREAMS frame. On frontend, this was mostly
useless as haproxy would never initiate new bidirectional streams.
However, this becomes necessary to control stream flow-control when
using QUIC as a client on the backend side.

Parsing of MAX_STREAMS is implemented via new qcc_recv_max_streams().
This allows to update <ms_uni>/<ms_bidi> QCC fields.

This patch is necessary to achieve QUIC backend connection reuse.