chore: prepare for release

[cartercanedy]

CI is failing bc of a silent bump in msrv for thiserror-impl. There was also a silent msrv bump in windows-link, so we can't run tests against a windows host.

Goals:

• Bump MSRV to 1.71/crate version to v0.5
• add macos/windows hosts to the CI testing matrix

[birkenfeld]

LGTM!

[birkenfeld]

Do you have further (breaking) changes in mind? If not, I'd be fine with making it 1.0 instead of 0.5.

[cartercanedy]

I think I want to address the lifetime virus. We could refactor the client into a shared Arc<InnerClient> that'll get wrapped in a new Client type, and since that's Send + Sync we could just dupe the inner arc for all of the downstream APIs and get rid of the bare shared ref. There's some wiggle-room there, so I'll noodle around a bit to see what the ergonomics of that might look like.

I also want to flesh out callbacks, too. I'll spend some time seeing if I can touch that up.

There's also the issue of being able to handle both tcp and UDS. That shouldn't be too hard, but I anticipate seeing an API break for that.

Once we've gotten a handle on these, then I think we're good for 1.0!