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    878 suites   38m 40s ⏱️
3 873 tests 3 134 ✅   739 💤 0 ❌
8 328 runs  6 706 ✅ 1 622 💤 0 ❌

Results for commit 9fb16df.

♻️ This comment has been updated with latest results.

[rcd27]

Hell yea, let's go! :)