Add send_async method to AgentLink so it's easier to work with futures

[stoically]

Is your feature request related to a problem? Please describe.
When having to call async functions inside of agent methods like update and handle_input an future closure is needed (with e.g. wasm-bindgen-futures)

Describe the solution you'd like
An convenience wrapper like send_async that takes an async closure and handles execution would be handy

Describe alternatives you've considered
Allowing some of the Agent trait methods to be async (with e.g. async-trait) might be an alternative but would come with added complexity to handle cases of lingering awaits

Additional context
The case where an send_async closure calls the AgentLink after it was dropped would cause a panic, so this might be something to be considered

Similarly send_future previously existed on components but was removed. Maybe an feature flag for such helper methods might be the right choice.

Related: #1209

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[kellpossible]

FYI we have send_future now for ComponentLink and AgentLink in the yewtil crate (https://github.com/yewstack/yew/blob/master/yewtil/src/future.rs#L62), does that cover this usecase?

[jstarry]

Yeah, sounds good, thanks for pointing that out!

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