[CI] - Run tests and/or compilation separately for each workspace crate

[Dinonard]

It's possible that even though our cargo check or cargo test work just fine, compiling or testing them separately will fail because they don't define correctly dependency features. This is easily hidden when testing everything since it's likely that all necessary features will be enabled.

To avoid this, introduce a new job which will check test each crate individually.

for package in $(cargo metadata --format-version=1 --no-deps | jq -r '.packages[].name'); do
    cargo test -p $package
done

[Dinonard]

Should be handled by the introduction of zepter into CI.