Preliminary Vast AI support

[kristopolous]

This is preliminary support for Vast. It currently works on an unreleased version of the SDK which we will soon get up to PyPy

The document https://docs.google.com/document/d/1oWox3qb3Kz3wXXSGg9ZJWwijoa99a3PIQUHBR8UgEGs/edit?pli=1&tab=t.0 was followed and all the testing passed

Tested (run the relevant ones):

• Code formatting: bash format.sh
• Any manual or new tests for this PR (please specify below)
• All smoke tests: pytest tests/test_smoke.py
• Relevant individual smoke tests: pytest tests/test_smoke.py::test_fill_in_the_name
• Backward compatibility tests: conda deactivate; bash -i tests/backward_compatibility_tests.sh

I'm pretty sure there will need to be edits, I'm fine with that. This is attempt 1. The outstanding work:

We need to

• tidy up our dockerhub and will get a better image to launch.
• release the updates to the sdk and come up with a pip name for it.
• get our catalog to update in the git hook flow as described (my goal is every 6 hours)