Consider Taking Over reactive-grpc

[making]

As mentioned in this issue salesforce/reactive-grpc#337,
reactive-grpc has effectively been paused.
How about taking over reactive-grpc (probably only the reactor support) in Spring gRPC?

[dsyer]

Interesting idea. We have avoided getting involved in the code generation process so far here. Let's see if anyone else votes.

[o-shevchenko]

It would be great to have reactive-gRPC support in Spring!
We heavily use Reactor with gRPC (from Salesforce) in our Spring-based services for handling gRPC streams.
We're looking forward to seeing this become part of the official Spring ecosystem.

[ajax-semenov-y]

We're also looking forward to this! Currently using Salesforce's reactive-grpc with Reactor for our Spring services. Having native support in Spring would be a big improvement.

[dsyer]

Reactive gRPC also depends on grpc-java-contrib and neither has an Apache license, so it's not straighforward to just take the code and transfer ownership.