Move axum-extra's Query type to axum

[jplatte]

From https://github.com/tokio-rs/axum/issues/1041#issuecomment-2539584964

I just came across this alternative Query impl and I was wondering: is there is a downside to making this implementation the default in axum itself? are there plans to eventually do that?

As the creator of the underlying crate I may be biased a bit. There's probably some cases where it's a tad slower but that should be everything in terms of downsides.