Refactor Rust CI a bit

[gadomski]

With #696, the tests take a lot longer to run since there's more doc tests. We can probably break up the checks in Lint and Test to not run the entire test suite twice, sequentially.

@gadomski can take this on after #696 lands.

[kylebarron]

I remember reading somewhere that doc tests are really slow because each is compiled as its own binary.

References:

• Rustdoc should run all doctests in one binary rust-lang/rust#75341
• https://mutants.rs/performance.html#avoid-doctests

[gadomski]

I remember reading somewhere that doc tests are really slow because each is compiled as its own binary.

Yup, it's a bit of a tradeoff, but I still like having them generally because it's such a good way to ensure your docs Actually Work™.

We'll save a lot by not running tests twice here:

geoarrow-rs/.github/workflows/ci.yml

Lines 58 to 59 in 77381c3

	cargo test --all
	cargo test --all --all-features

There may be some other sensible split-into-separate-jobs as well.