chore(build): compile protobufs with protox (#2122)

* chore(build): compile protobufs with protox

protox is a pure-rust implementation of the protobuf compiler.
Therefore, it can be managed by cargo.

This removes the implicit dependency on protoc being available
in the environment for the build.

* fix(build): replace copypasta in build script

The paths passed to `compile` aren't actually used by the build.
`skip_protoc_run` prevents that.
That's why a clean build succeeds even with this mistake.

However, the paths are passed to a `cargo:rerun-if-changed` directive.
So this mistake would've caused a failed incremental build if the
protobuf definitions were changed.

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