allow cfg attr typeshare -> typeshare2

[darrell-roberts]

Using typeshared types may be behind a feature and as such the annotation would be something like #[cfg_attr(feature = "typeshare-support", typeshare)].

This PR adds support for generating typeshare types using a cfg_attr condition.

I'll be adding this to #274 then porting it back into typeshare2

Other changes:

• Update and add snapshot testing back to CI
• Update and add deterministic testing back to CI
• Fix all clippy errors
• Add back logger and info statements

[Progdrasil]

This works perfectly for 1Password/passkey-rs#68

[smcgovern-proj]

This LGTM and works locally (with the caveat that I'm not the most familiar with syn as a lib/syn-related idioms.) Thanks a bunch for making the QOL improvements like doc comments + logger.