New network transport library based on QUIC

[LaurentRDC]

This is a Cloud Haskell backend based on QUIC.

Fixes #474

The advantages of using QUIC are:

• Security -- the QUIC protocol is encrypted whereas TCP is not necessarily encrypted.
• Better support for network migration, such as IoT devices switching from WiFi to 5G;
• Better performance for network topologies with lots of interconnections between endpoints.

The benchmarking suite in this PR shows that this backend is competitive with network-transport-tcp, with enhanced performance for endpoints with multiple incoming connections.

Cloud Haskell has been tested (cabal test distributed-process-tests -f quic), but these tests have not been activated in CI yet.

[LaurentRDC]

Getting this done is incredibly hard. I can't believe how hard it is to spin up a new transport layer.

One thing that makes it harder than it should is that some behavior is only documented via tests. So I got 80% of the way to the tests passing, but the next set of tests require a whole lot of refactoring.

I don't think I'll have the time (or motivation) to get back to this in the near future. At least I found and fixed a bug in the underlying quic library.

Edit 2025-11-12: I found the motivation to get back to this

[LaurentRDC]

I'm getting really close to being able to pass through all of the tests in network-transport-tests. However most of the test results are flaky. Still, encouraging!