Add github actions to run cargo tests on all the commits.

[ksolana]

[brson]

Make sure to run cargo fmt --checked too.

[brson]

We probably only need to run the move-mv-llvm-compiler tests and the move-native tests. Or at least, have one configuration doing just those, and another doing the full test suite. Note the move-native crate is not part of the move workspace so will not run as part of cargo test - it has to be run explicitly with --manifest-path.