Migrate to kotlinx-io and ktor 3.0

[whyoleg]

Fixes #277 and probably prepares ground for #110 (in some way, if it's possible).
Note: it's breaking change!

• rsocket-core now depends only on kotlinx.coroutines and kotlinx.io!
• ByteReadPacket was replaced with Buffer and could be revisited soon for Payload/Metadata API in favor of ByteString or Source
  • Buffer was done to ease migration: it has size and copy support which is needed for Payload API
• ktor transports updated to 3.0.1
  • wasm and all native targets support will be implemented in next PR
• leak tracking in tests was removed, as there is no way to do it until Leak tracing mechanism Kotlin/kotlinx-io#144
  • at this moment it's less of an issue, as kotlinx.io.Buffer is backed by ByteArray and so is fully managed by GC

[github-actions]

Test Results

  878 files   -   8      1 errors    877 suites   - 9   44m 57s ⏱️ - 28m 11s
3 873 tests  -  48  3 128 ✅  -  33    739 💤  - 12   6 ❌  - 3 
8 304 runs   - 216  6 674 ✅  - 160  1 616 💤  - 54  14 ❌  - 2 

For more details on these parsing errors and failures, see this check.

Results for commit 9feca27. ± Comparison against base commit 353fe93.