Non-async version of rust bitcoin client

[dr-orlovsky]

Right now the rust client crate provides only async API. While it is indeed used in many projects, there are cases when async is not desired. For instance, I always put tasks into a dedicated thread, communicating to it using channels; and I avoid using any async runtimes.

Is it possible to have a non-async version of the library? I am willing to work on the PR adding it, but are there any chances of getting it merged?

[bigspider]

There is already a non async client, let me know if you have any issues using it - I definitely care about keeping it working.

[dr-orlovsky]

Thank you for pointing out at it! Checking in my integration and will let you know