fix(operations): Use rdkafka crate from the upstream Git repository

[ghost]

Fixes rdkafka part of #1032.

Although it solves problem with compiling rdkafka crate, there are still linking issues with it unsolved yet.

[ghost]

The problem with CI is fede1024/rust-rdkafka#126. Newer versions of rust-rdkafka crate require libclang and libllvm. While the requirement might seem as too much, I generally like the reasoning behind switching to generation of bindings during build time implemented in fede1024/rust-rdkafka#119 because it simplifies compilation for new platforms. For example, without it #859 would be much harder to do.

[benesch]

I just merged a change to rust-rdkafka that removes the build-time dependency on clang/libclang, if you want to give that a try! Details here: fede1024/rust-rdkafka#126 (comment)

[LucioFranco]

@benesch would it be possible to get a release of this?

[benesch]

Sorry for the long delay here—but 0.23 is out and incorporates all the build system fixes.