compile_commands.json

It could be nice if we could generate/distribute compile_commands.json to better interact with some IDE and our c++ code.

I.e. In Bazel and also in Vscode the the official Bazel team vscode plugin we don't have in tree support to generate compile_commands:
https://github.com/bazelbuild/bazel/issues/258
https://github.com/bazelbuild/vscode-bazel/issues/179

I've tried some quite popular community workaround like:
https://github.com/grailbio/bazel-compilation-database

But the problem is that we are using --action_env for build when we generate our .bazelrc with python configure.py and so these arguments not supported in other command like e.g. bazel query https://github.com/bazelbuild/bazel/issues/10226.
This is going to invalidate the official bazel vscode plugin that need to execute query command but also the bazel-compilation-database workaround cause we have problem to retrieve our env variable.

Start by reading python configure.py and the generated .bazelrc, then examine how bazel query handles the --action_env settings described in the issue. Compare the official VS Code Bazel plugin and bazel-compilation-database workaround linked here. Done means a usable compile_commands.json can be generated and distributed for the C++ code without invalidating the required environment variables.