Experiment overhauls

[colinxs]

• Remove special-casing of Git repo's. Just copy over the folder (but still capture repo metadata).
• Add ability to instantiate Experiment/JLSOFile (e.g. with_experiment) which (1) activate's the environment stored in the JLSOFile's TOML's and (2) unpacks the saved files into temp dir.
  • Benchmark overhead of (1) instantiation of environment and (2) unpacking
• rename? Something like ExperimentFile? LyceumFile?

[colinxs]

From Lyceum/LyceumMuJoCo.jl#5:
"""
We want to save more into jlso's:

Save experiment data
save the environment file at that time
save the loaded model file at that time (and meshes? or could symlink...)
save policy, value function, etc.

Then load it all. At least for a visualizer to bring it back. A big reason for this is to run an experiment on a bigger machine, then copy back the jlso onto your local host for rendering; it's annoying to sync the code repos to load the env...
""" - kendall

[colinxs]

also make sure meta doesn't clash with user keys

[colinxs]

Tar.jl