SAC supports parallel environments

[oliverc1623]

Howdy!

I have extended the SAC torchcompile file such that it can train on parallelized environments. I plan to provide evidence showing learning curves featuring vectorized environments. I want to open up the pull request and welcome questions, comments, or concerns about how I am implementing this feature.

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[vmoens]

I like it!
Do you have some curves to share on the perf of this (with / without compile or cudagraph)?