Redo properties, take 2

[WorldSEnder]

Description

This PR is a follow up to #2369, based on the pattern described in #2369 (comment). It solves the blocker towards inherited props by replacing the manual builder steps tracking the state of the builder (required props) with a trait-guided solution, based on the central HasProp and HasAllProps traits.

I suppose it would also make sense to have another look at #1634. Currently, all props are added in alphabetical order, but with the trait approach, the order shouldn't matter.

Checklist

• I have reviewed my own code
• I have added tests

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Size Comparison

examples	master (KB)	pull request (KB)	diff (KB)	diff (%)
boids	172.502	172.607	+0.105	+0.061%
contexts	109.604	109.619	+0.015	+0.013%
counter	86.551	86.551	0	0.000%
counter_functional	87.200	87.200	0	0.000%
dyn_create_destroy_apps	89.691	89.691	0	0.000%
file_upload	102.626	102.626	0	0.000%
function_memory_game	166.910	166.910	0	0.000%
function_router	351.658	351.781	+0.123	+0.035%
function_todomvc	161.558	161.558	0	0.000%
futures	226.277	226.277	0	0.000%
game_of_life	107.188	107.188	0	0.000%
inner_html	83.618	83.618	0	0.000%
js_callback	112.829	112.845	+0.016	+0.014%
keyed_list	195.088	195.106	+0.019	+0.010%
mount_point	86.181	86.181	0	0.000%
nested_list	115.513	115.688	+0.175	+0.151%
node_refs	93.596	93.596	0	0.000%
password_strength	1538.306	1538.306	0	0.000%
portals	97.206	97.221	+0.015	+0.015%
router	320.586	320.543	-0.043	-0.013%
simple_ssr	154.478	154.493	+0.016	+0.010%
ssr_router	397.648	397.771	+0.123	+0.031%
suspense	110.519	110.538	+0.020	+0.018%
timer	89.287	89.287	0	0.000%
todomvc	142.614	142.614	0	0.000%
two_apps	87.159	87.159	0	0.000%
web_worker_fib	153.407	153.407	0	0.000%
webgl	87.438	87.438	0	0.000%

✅ None of the examples has changed their size significantly.

[hamza1311]

Implementation looks good to me. I assume prop inheritance (with Deref/DerefMut?) will come in the future, right?

What if we create a crate like typed-builder (similar to how #2563 creates imut)? That way a type-safe builders can be used outside of Yew as well.

[hamza1311]

Looks good to me!

The Deref/DerefMut stuff and prop inheritance can come later. If possible, we should also consider taking it out of Yew and making a separate builder crate for this

[WorldSEnder]

Tagged as technically breaking change, because it removes the old builder-style approach in user code. If anybody actually needs the old style, we can think of a replacement, but I think the props macro or initializing the props directly is often a good work-around.

- Props::Builder::new().x(1).y(2).build()
+ props!{ Props { x: 1, y: 2 } }

---

I have double-checked the error message stay informative in rust stable, also. I'll merge this in the evening or tomorrow.