Migrate to coroutines 1.7

[whyoleg]

Needs ktor with coroutines 1.7 support, likely ktor 2.3.2 - because of incompatibilities. In scope of this we need:

• migrate to turbine 1.0 https://github.com/cashapp/turbine/releases/tag/1.0.0
• use kotlinx-coroutines-test instead of hand written runTest
• use Dispatchers.IO in ktor-tcp native transport
• check performance difference with new channels algorithm
• recheck experimental API usage