Update Scala & libs, fix tests & compilation

[igor-vovk]

Hi and thank you for your work on this library!

We are trying to use the library as a part of GRPC adoption process, and thus we needed to bring it to the latest versions of everything. This PR is quite heavy on changes, from the major library updates:

• Added Scala 3.3 compilation target (latest LTS release)
• Updated cats-effect from v2 to v3.
• Updated Akka Http
• protobuf and grpc libraries were updated to their latest versions
• latest sbt version

Notable changes:

• Updating cats-effect to v3 required an addition of LiftToFuture class, since there is no way to convert F to Future in latest cats-effect library
• Updating Akka-Http required a little bit different approach when working with Content-Type headers. Akka's Content-Type class constructor is now package-private. So the header is now defined either as a part of RequestEntity or during the serialization stage.
• fixed protoc binary download on ARM-architecture (M1 Macs)
• fixed test flakiness because of use System.nanoTime when creating ReflectionGrpcBridge (non-unique)
• unapply pattern when defining variables in tests (val Some(...) = ...) was throwing an error and required adding @unchecked, decided to remove it and match against particular wrappers

Further improvements:

• I want to open a separate PR with migration from Akka to Pekko. This will require changing namespaces. Please tell WDYT about that?

[igor-vovk]

Hi! It seems this library is not supported anymore, so I wrote https://github.com/igor-vovk/connect-rpc-scala. As a plus, it is compliant with connect-rpc protoc client plugins. Not sure if you would want to mark this library as unsupported.

[augi]

Sorry, I did get any notification about this PR :( If you resolve the conflicts, I will merge it ASAP.

[augi]

But I'm afraid that I will not be able to publish the new version, because Maven Central publishing has been changed again :(