Perform various rust checks in a github action

[o0Ignition0o]

fix #14

Checklist

• [x] tests are passing with cargo test.
• [x] tests and/or benchmarks are included
• [x] documentation is changed or added
• [x] commit message is clear

[o0Ignition0o]

DO NOT MERGE YET:

I need to do a lot of cleanup: move the OS / toolchain matrix to our action.yml, and remove the now redundant ci and clippy.yml

[o0Ignition0o]

yay \o/ Ok now let's do more things in parallel so it runs faster.