build: install cxxbridge-cmd to build Rust-C++ bindings (#426)

This adds the Rust tool to generate h and cc that facilitate calling
Rust from C++ and C++ from Rust. Add it to the build environment.

(cherry picked from commit 29865b9)

Author: yonch

build-tools/final/Dockerfile

@@ -90,7 +90,8 @@ RUN sudo wget \
 # Rust toolchain for building Rust components
 RUN curl https://sh.rustup.rs -sSf | sh -s -- -y --profile minimal --default-toolchain ${RUST_TOOLCHAIN} && \
     . "$HOME/.cargo/env" && \
-    rustup component add rustfmt clippy
+    rustup component add rustfmt clippy && \
+    cargo install cxxbridge-cmd
 ENV PATH="${HOME}/.cargo/bin:${PATH}"
 
 # Preprocessor for BPF used by cmake