Remove dependency from config to utils

[lukemerrick]

I have some code which constructs and writes out to YAML files configs which are used to queue up litgpt training jobs on remote machines. Unfortunately this code starts up really slowly because importing the litgpt.config submodule pulls in a ton of transitive dependencies due to its from litgpt.utils import find_multiple line (eventually torch, triton, etc. are imported). This causes as much as a 30+ second delay to any script I write that manipulates litgpt config objects.

I noticed that find_multiple is actually only ever used in litgpt.config anyhow, so I was wondering if it would be okay to scoot this function over and remove the dependency from config on utils. With this change, it is possible to write code which imports the config submodule alone and thus runs very quickly (not pulling in any of the heavy deps that current come into the Python interpreter).

Is this change something y'all might be amenable to?

[lukemerrick]

@Borda It looks like the tests are trying to pull from Huggingface but are getting 401-unauthorized errors. Locally running the affected test, I see everything is passing in the config tests, so it seems the CI is flaky. Can you help get this re-run / skip the gate on these unrelated tests?