v1.0 networking backports (#2486)

* ProtocolId can now be more than 3 bytes (#2350)

* Update to libp2p v0.7.0 (#2343)

* Update to libp2p master

* Fix tests

* More tests fixing

* Remove the multiplexed networking system (#2373)

* Remove the multiplexed networking system

* Rename BackCompat to Normal

* Remove CustomMessageId

* Fix tests

* Allow multiple substreams (#2379)

* Allow multiple substreams

* Update core/network-libp2p/src/custom_proto/handler.rs

Co-Authored-By: tomaka <[email protected]>

* Fix #2403 (#2404)

* Fix #2403

* Apply suggestions from code review

Co-Authored-By: tomaka <[email protected]>

* Split Context::send_message into multiple methods (#2409)

* Split Context::send_message into multiple methods

* Apply suggestions from code review

Co-Authored-By: tomaka <[email protected]>

* Add reason for closing and fix multiple substreams (#2437)

* Simplify the code of connection_keep_alive (#2438)

* Drop connections when the handler gets disabled (#2439)

* Drop connections when the handler gets disabled

* Add test

* Disable mDNS when passing --dev (#2467)

* Show more information when too many addresses are reported (#2473)

* Show more information when too many addresses are reported

* Update core/network-libp2p/src/behaviour.rs

Co-Authored-By: tomaka <[email protected]>