Explicit duplicate key check

[WorldSEnder]

A discussion on discord shows a hard to read error message when accidentally using duplicate keys in lists.
While this is still not supported with this PR, change this to a nicer error message, identifying the offending index and key in the list.

Example stack trace:

slice index starts at 3 but ends at 2

$__rust_start_panic    @    
$rust_panic    @    
$std::panicking::rust_panic_with_hook::h76c11b8da342ec83    @    
$std::panicking::begin_panic_handler::{{closure}}::h66f67617d4dba49d    @    
$std::sys::backtrace::__rust_end_short_backtrace::h622a24dbddaa3376    @    
$rust_begin_unwind    @    
$core::panicking::panic_fmt::h4fd7a00ecfbf278a    @    
$core::slice::index::slice_index_order_fail::do_panic::runtime::hc8b046ffeba454c8    @    
$core::slice::index::slice_index_order_fail::h99288b888202ded2    @    
$core::slice::index::range::hf7288dd9129769c0    @    
$alloc::vec::Vec<T,A>::drain::h7f8c579b770e112f    @    
$alloc::vec::Vec<T,A>::splice::h14dfdac10dd4d213    @    
$yew::dom_bundle::blist::BList::apply_keyed::h67738f26f9ea56a7    @    
$yew::dom_bundle::blist::<impl yew::dom_bundle::traits::Reconcilable for yew::virtual_dom::vlist::VList>::reconcile::h69c9ea01d4616fbc    @

[github-actions]

Size Comparison

examples	master (KB)	pull request (KB)	diff (KB)	diff (%)

✅ None of the examples has changed their size significantly.

[github-actions]

Benchmark - core

Yew Master

vnode           fastest       │ slowest       │ median        │ mean          │ samples │ iters
╰─ vnode_clone  2.635 ns      │ 2.754 ns      │ 2.642 ns      │ 2.647 ns      │ 100     │ 1000000000

Pull Request

vnode           fastest       │ slowest       │ median        │ mean          │ samples │ iters
╰─ vnode_clone  2.686 ns      │ 3.678 ns      │ 2.707 ns      │ 2.738 ns      │ 100     │ 1000000000

[github-actions]

Visit the preview URL for this PR (updated for commit 124b51b):

https://yew-rs--pr3785-duplicate-key-check-w02i5ixk.web.app

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[github-actions]

Benchmark - SSR

Yew Master

Benchmark	Round	Min (ms)	Max (ms)	Mean (ms)	Standard Deviation
Baseline	10	288.378	291.591	290.495	0.959
Hello World	10	498.577	538.638	505.230	11.881
Function Router	10	1604.646	1648.728	1625.231	14.472
Concurrent Task	10	1004.922	1007.583	1006.013	0.733
Many Providers	10	1156.611	1224.946	1187.634	22.197

Pull Request

Benchmark	Round	Min (ms)	Max (ms)	Mean (ms)	Standard Deviation
Baseline	10	290.855	295.291	291.591	1.343
Hello World	10	493.999	503.726	496.714	2.871
Function Router	10	1626.060	1656.363	1638.888	10.138
Concurrent Task	10	1005.822	1007.221	1006.428	0.448
Many Providers	10	1157.029	1195.273	1178.013	11.258