Implement net.cidr_contains builtin

[tjons]

Implement the net.cidr_contains builtin in Regorus. Added the IpNet crate to handle and standardize CIDR parsing, which will be useful for the remainder of the net.* built-ins.

[tjons]

@anakrish these java bindings are killing me... I figured out how to update them based on the github action, but I have a couple questions:

1. Is there a reason the Java bindings fail but all other languages succeed? All languages with a Cargo.lock file seem to build bindings with --frozen, and while the Java binding uses --locked as well, --frozen should be more restrictive than --locked.
2. Could I contribute (in a future PR) some sort of tooling to check this locally before pushing to CI? Perhaps leveraging https://docs.rs/cargo-task/latest/cargo_task/ or adding something to the pre-push hook? Usually in Go projects we have Makefile targets to check code generation. Right now the only alternative I can think of is running the actions locally nektos/act which usually is a little more resource-intensive and harder to remember.

[anakrish]

Hey @tjons,

1.a I don't exactly know why Java bindings fail. In the past, I have seen it fail due to stricter clippy errors. I thought my recent PR that uses the same rust toolchain uniformly would fix it. But looks like it doesn't. cc @unexge for insights.
1.b Yes. It should also use --frozen.

2. Yes, testing it locally is a great idea. The current pre commit hook approach is something I put together to prevent me from breaking stuff, while I was learning Rust. If there are better approaches (say cargo-task) we can totally use it.

[anakrish]

Hey @tjons, Looks like all the OPA tests are passing. Kindly squash the commits and use a conventional commit style changelist description.

I can then approve, rerun the test and merge.
Thanks for the contribution!

[tjons]

Created #475 to track language binding generation, and updated the commit message - thanks @anakrish!

[anakrish]

LGTM. Thanks for the contribution @tjons