Add support for blocking server stubs

Is your feature request related to a problem?

Currently there's a blocking client v2 stub generated, but we don't have a server stub to match.

Describe the solution you'd like

A simplified api surface for developers who run on virtual threads for example, with a blocking-native api.

Describe alternatives you've considered

The closest thing to programming with a blocking api is the kotlin coroutines generated stubs.

Additional context

From what I can tell there's existing code in the repo to support blocking server stubs, but code generation does not exist for it.