Add script to install CI versions of all external Bob dependencies

This is a proposal for a script that would help create a local environment containing all external Bob dependencies and using the same pins as the CI.

TODO

• Create entry point (bdt dev dependencies)
• Update documentation (Note : the CI build is seemingly using cuda builds of the pytorch and tensorflow, which would not be the case locally unless having done an export CONDA_OVERRIDE_CUDA=x.x or running on a machine with GPU.)
• Add compilers package to the installed list

ping @ydayer @amohammadi

Do you feel this is a sensible way to approach things ?