callback-infra: dev env is not standard and not documented

[koushik-ms]

The callback-infra application build & runs using cmake, a c++17 compilation toolchain and external libraries such as googletest and googlemock. These dependencies are outside the source-tree and their versioning and installation/ configuration steps are not documented.

Running the build steps in the README.md file on a fresh ubuntu and manjaro installation failed and failed for different reasons. This needs to be fixed.

Proposed solutions:

1. Dockerize dev-env and publish Dockerfile in repo
2. Use bazel and hermetic toolchains for build process that pull-in necessary dependencies from controlled sources.
3. List and document steps for installing necessary dependencies on supported platforms