Speed up CI, Reduce container image size

[luigi311]

Use caching for cargo build to reduce the build times from 5 mins to 45 seconds when dependencies are non changing

Restructure the entire Dockerfile to use multistaging to reduce the docker image by ~500 mb from 1.05 GB to 584 MB.
Use github action internal caching so we dont have to deal with uploading and download the cache as an artifact.
Use cargo chef to build all the dependencies as a layer so that can be cached and have to only compile av1an itself.

Without cargo chef after my initial changes cold run was 9m 49s and when caching the build times came down to 6m 28s but the cache would be invalided on any code change so it was not usable
With cargo chef on a cold run it was still 9m 49s and a cached run it came down to 4m 57s, since this is caching the dependencies and still building av1an the time going forward should be closer to the 5m mark than the 9m 49s cold run.

[master-of-zen]

Amazing 🤩