Allow any type to be used as children

[futursolo]

Description

Partially addresses #3022.

This pull request makes the following changes:

1. Allowing any type to be passed as children as long as IntoPropValue<T> for children with type T.
   E.g.: One can now use render props as children:

   html! {
       <Comp>
           {|p: RenderProps| html!{<>{"Hello, "}{p.name}</>}}
       </Comp>
   }

2. Children is now a type alias of VList.

3. Users can now choose between Children (VList), ChildrenWithProps(ChildrenRenderer<VChild<T>>)
   and Html for html-like children with various upside and downside based on their choice.

4. When a component has only 1 child, it does not pass through an iterator and Vec.

5. VList holds children in Rc<Vec<VNode>> hence makes it cheap to clone.

6. VTag now holds VNode as its children type. This optimises for single child VTag by avoiding an allocation of single child VList.

Checklist

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

[github-actions]

Visit the preview URL for this PR (updated for commit d8f0178):

https://yew-rs--pr3042-make-mut-rkaxx4l8.web.app

_{(expires Fri, 09 Jun 2023 13:27:47 GMT)}

_{🔥 via Firebase Hosting GitHub Action 🌎}

[github-actions]

Benchmark - SSR

Yew Master

Benchmark	Round	Min (ms)	Max (ms)	Mean (ms)	Standard Deviation
Baseline	10	359.920	360.164	360.039	0.080
Hello World	10	688.621	693.604	691.513	1.707
Function Router	10	2294.510	2321.381	2303.627	10.302
Concurrent Task	10	1006.778	1008.454	1007.653	0.451
Many Providers	10	1849.314	1968.644	1869.912	35.345

Pull Request

Benchmark	Round	Min (ms)	Max (ms)	Mean (ms)	Standard Deviation
Baseline	10	392.857	393.166	392.947	0.099
Hello World	10	640.185	645.973	643.497	1.603
Function Router	10	2135.015	2163.038	2152.890	8.521
Concurrent Task	10	1006.587	1007.832	1007.299	0.367
Many Providers	10	1521.753	1550.403	1536.899	10.735

[github-actions]

Size Comparison

examples	master (KB)	pull request (KB)	diff (KB)	diff (%)
async_clock	103.989	104.332	+0.343	+0.330%
boids	174.320	175.784	+1.464	+0.840%
communication_child_to_parent	96.614	97.170	+0.556	+0.575%
communication_grandchild_with_grandparent	108.877	109.416	+0.539	+0.495%
communication_grandparent_to_grandchild	105.056	105.595	+0.539	+0.513%
communication_parent_to_child	93.715	94.285	+0.570	+0.609%
contexts	109.621	109.701	+0.080	+0.073%
counter	90.216	91.318	+1.103	+1.222%
counter_functional	90.652	91.934	+1.281	+1.413%
dyn_create_destroy_apps	92.962	94.363	+1.401	+1.507%
file_upload	104.396	105.412	+1.017	+0.974%
function_memory_game	169.545	170.246	+0.701	+0.414%
function_router	338.952	343.229	+4.277	+1.262%
function_todomvc	163.585	164.670	+1.085	+0.663%
futures	227.550	229.403	+1.854	+0.815%
game_of_life	110.493	111.748	+1.255	+1.136%
immutable	189.062	190.852	+1.789	+0.946%
inner_html	86.808	87.407	+0.600	+0.691%
js_callback	113.621	114.341	+0.720	+0.633%
keyed_list	201.889	202.050	+0.161	+0.080%
mount_point	89.908	90.430	+0.521	+0.580%
nested_list	114.606	116.029	+1.423	+1.242%
node_refs	97.434	98.114	+0.681	+0.699%
password_strength	1589.523	1590.251	+0.728	+0.046%
portals	98.817	100.178	+1.360	+1.377%
router	309.236	312.852	+3.615	+1.169%
simple_ssr	145.282	146.059	+0.776	+0.534%
ssr_router	377.387	381.375	+3.988	+1.057%
suspense	111.145	112.058	+0.913	+0.822%
timer	93.052	94.030	+0.979	+1.052%
timer_functional	101.448	102.162	+0.714	+0.704%
todomvc	144.882	146.339	+1.457	+1.006%
two_apps	90.853	91.372	+0.520	+0.572%
web_worker_fib	155.089	156.469	+1.380	+0.890%
webgl	89.320	89.864	+0.544	+0.609%

⚠️ The following examples have changed their size significantly:

examples	master (KB)	pull request (KB)	diff (KB)	diff (%)
counter	90.216	91.318	+1.103	+1.222%
counter_functional	90.652	91.934	+1.281	+1.413%
dyn_create_destroy_apps	92.962	94.363	+1.401	+1.507%
function_router	338.952	343.229	+4.277	+1.262%
game_of_life	110.493	111.748	+1.255	+1.136%
nested_list	114.606	116.029	+1.423	+1.242%
portals	98.817	100.178	+1.360	+1.377%
router	309.236	312.852	+3.615	+1.169%
ssr_router	377.387	381.375	+3.988	+1.057%
timer	93.052	94.030	+0.979	+1.052%
todomvc	144.882	146.339	+1.457	+1.006%

[voidpumpkin]

If you update the PR i think we could merge it.

[futursolo]

If you update the PR i think we could merge it.

I think this pull request still needs some small tidying up around how optional types are being converted.
I will address this after #3050.

[futursolo]

Superseded by #3289.