Introduce a new use_async hook, that allows for setting dependencies

[Ekleog]

Description

Introduce an use_async hook, that performs a computation in another task and returns the result.

(Probably) fixes #364

The main API design question is whether we want to introduce the idea of cancellation in the API or not. Adding it afterwards would likely require adding a variant to UseAsyncStatus. This being said, Yew is not stable yet, and probably at least 90% of the use cases are covered by this API, so I think it makes sense to postpone the decision after verifying that there is an actual need.

This PR is not done yet, and is here mostly to gather feedback on whether this is something that Yew developers would be interested in having upstream. I'm using it in my own code here, and thought it would likely be helpful to other people too.

The alternatives I know of are:

• The use_async and use_async_with_options from yew_hooks. They do not support introducing dependencies that would trigger a future re-computation.
• yewtil's LinkFuture. Not having used it I'm less familiar with it, but AFAIU it requires struct components, which is not the direction Yew development seems to be moving towards.

Checklist

Things still missing if you confirm that this PR is of interest to you:

• [x] I have reviewed my own code
• [ ] I have added tests
• [ ] Writing clear documentation
• [ ] Fixing all of CI

[github-actions[bot]]

Size Comparison

examples	master (KB)	pull request (KB)	diff (KB)	diff (%)
async_clock	100.530	N/A	N/A	N/A
boids	173.547	N/A	N/A	N/A
communication_child_to_parent	93.072	N/A	N/A	N/A
communication_grandchild_with_grandparent	105.655	N/A	N/A	N/A
communication_grandparent_to_grandchild	101.043	N/A	N/A	N/A
communication_parent_to_child	89.413	N/A	N/A	N/A
contexts	105.821	N/A	N/A	N/A
counter	86.281	N/A	N/A	N/A
counter_functional	86.451	N/A	N/A	N/A
dyn_create_destroy_apps	89.275	N/A	N/A	N/A
file_upload	100.440	N/A	N/A	N/A
function_memory_game	172.253	N/A	N/A	N/A
function_router	349.531	N/A	N/A	N/A
function_todomvc	162.304	N/A	N/A	N/A
futures	229.101	N/A	N/A	N/A
game_of_life	109.982	N/A	N/A	N/A
immutable	189.679	N/A	N/A	N/A
inner_html	80.040	N/A	N/A	N/A
js_callback	109.576	N/A	N/A	N/A
keyed_list	198.589	N/A	N/A	N/A
mount_point	82.877	N/A	N/A	N/A
nested_list	114.631	N/A	N/A	N/A
node_refs	90.462	N/A	N/A	N/A
password_strength	1726.314	N/A	N/A	N/A
portals	93.754	N/A	N/A	N/A
router	318.227	N/A	N/A	N/A
simple_ssr	141.650	N/A	N/A	N/A
ssr_router	389.408	N/A	N/A	N/A
suspense	116.107	N/A	N/A	N/A
timer	88.976	N/A	N/A	N/A
timer_functional	97.995	N/A	N/A	N/A
todomvc	142.318	N/A	N/A	N/A
two_apps	85.590	N/A	N/A	N/A
web_worker_fib	136.037	N/A	N/A	N/A
web_worker_prime	186.757	N/A	N/A	N/A
webgl	82.662	N/A	N/A	N/A

✅ None of the examples has changed their size significantly.

[WorldSEnder]

@hamza1311 you might not have seen my earlier comment

[ranile]

@hamza1311 you might not have seen my earlier comment

Yep, totally missed that, my bad

[Ekleog]

Considering the time I've been having recently, I think I unfortunately won't have any to come back to this PR.

Going to close this, but anyone please feel free to take it over! :)