feature(cli): dioxus-cli as lib

[notdanilo]

Problem

While it is possible to wrap dx using std::process::Command, a more flexible and programmable approach would be to reuse dioxus-cli as a library. Publishing dioxus-cli as a library would greatly enhance its usability.

Solution

This PR exposes dioxus-cli as a library, making it possible to reuse dx instead of redirecting cli commands to it.

A good example is how bolt-cli uses anchor-cli as a library.
https://github.com/magicblock-labs/bolt/blob/main/crates/bolt-cli/src/lib.rs

[notdanilo]

Thanks for running the checks. I will fix them asap.

[jkelleyrtp]

Thanks! Also - do you mind adding a no_exhaustive on any structs in the public API of the cli?

I'm okay with opening up the CLI as a library but that means the CLI needs to follow semver. We should try to keep our public API minimal in that case. This means marking things as no_exhaustive where possible and not making too many things public.