Add Wait method

[gioccher]

RateLimiter requires to package the rate limited code into a method. This can get awkward very quickly if the code that needs to be rate limited contains other code that needs to be rate limited, and so following the flow of the program becomes a bit difficult.
As a result, I almost always end up defining and using the following Wait extension methods, to make RateLimiter look more like other synchronization classes (SemaphoreSlim, Monitor, WaitHandle) and avoid refactoring the code into a chain of methods.

public static class TimeLimiterExtensions
{
	private static readonly Action doNothing = delegate { };

	public static async Task Wait(this TimeLimiter timeLimiter)
	{
		await timeLimiter.Perform(doNothing);
	}

	public static async Task Wait(this TimeLimiter timeLimiter, CancellationToken cancellationToken)
	{
		await timeLimiter.Perform(doNothing, cancellationToken);
	}
}

I thought this would be beneficial to other users, and was wondering if you would incorporate something like this in the project.
I'm unsure about the contribution policy, so I'm asking here instead of just creating a pull request.

[David-Desmaisons]

Helllo @gioccher , thanks for the suggestion, I will need sometime to evaualate it and give you some feedback.

[David-Desmaisons]

Tnhiking of your use case and your implementation, I thnik that implementing an GetAwaiter on TimeLimiter (maybe as an extension method ) would provide the same usability and be more robust.
It would allow to await timelimter. Reefrence:
https://weblogs.asp.net/dixin/understanding-c-sharp-async-await-2-awaitable-awaiter-pattern

[gioccher]

That approach is definitely more elegant than the Wait extension method I've been using. I've pushed a couple of commits that implement that

[David-Desmaisons]

TimeLimiter are now awaitable.