re-export web_sys for user convenience

[blainehansen]

I found myself needing to annotate a handler event type, and didn't want to specify my own dependency on web_sys. This pull request should make patterns like the below easy:

use sycamore::web::web_sys;
let handle_enter = |event: web_sys::KeyboardEvent| {
	// ...
};

I also added js_sys. Are there any other libraries we should re-export? Is there any value in re-exporting wasm_bindgen for example?

[codecov]

Codecov Report

All modified lines are covered by tests ✅

Comparison is base (9c7bd44) 61.21% compared to head (9ab9345) 61.21%.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #568   +/-   ##
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  Coverage   61.21%   61.21%           
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  Files          55       55           
  Lines        9021     9021           
=======================================
  Hits         5522     5522           
  Misses       3499     3499           

Files	Coverage Δ
packages/sycamore-web/src/lib.rs	20.00% <ø> (ø)

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[arctic-hen7]

Maybe I'm missing something, but given web-sys is almost entirely controlled by feature flags, wouldn't this mean that users have to import it anyway almost always?

[lukechu10]

Maybe I'm missing something, but given web-sys is almost entirely controlled by feature flags, wouldn't this mean that users have to import it anyway almost always?

I agree with this sentiment about web-sys. It might make sense to re-export js-sys and wasm-bindgen, although I'm personally a bit iffy on this as well.

Yew used to have a web-sys re-export but they removed it: yewstack/yew#2084
To be fair, they still continue to re-export the event types which they use and so maybe we should be doing something similar?

[Dav1dde]

I think sycamore should only re-export types that are also used in public signatures of sycamore's types and traits.

[lukechu10]

Hi there, sorry for ignoring this for such a long time. I think what I would like to do is to have sycamore re-export js-sys and wasm-bindgen and have another module events which re-exports all the web-sys events only. Are you still interested in this? If so, please feel free to continue on this PR or open a new PR. If not, please let me know and I can take over. Thanks!

[lukechu10]

Closed in favor of #642. @blainehansen I've included the original commits from this PR to give you credit.