Add ability to create envs with conda lock files to avoid conda solve step

[Adam-D-Lewis]

Currently the environments on the hpc-master node require ~10GB of RAM in order for conda to be able to solve them. It'd be nice to be able to use conda lock files to avoid the long solve step.

[Adam-D-Lewis]

This could be done, however, it would be of limited use with the existing conda enviornments in the repo. The stable release of conda-lock at this time doesn't have support for pip dependencies though the main branch does. However, even the main branch at this time doesn't support syntax like https://github.com/jupyterhub/batchspawner/archive/129951ad11e3049567b94adb8c9725dc22225a1a.tar.gz in the environment files which is used heavily in the environments in this repo at this time.