Reintroduce SleepDurationProvider DelegateResult<TREsult> overload on WaitAndRetryAsync

[esbenbach]

Is your feature request related to a specific problem? Or an existing feature? Please describe.

I am trying to handle HTTP 429 as discussed in #414 - specifically using the sleepdurationprovider overload that takes DelegateResult<TResult> as an input.

It seems like this used to exist:

Polly/src/Polly.Shared/Retry/RetryTResultSyntaxAsync.cs

Line 615 in 9c133b6

public static RetryPolicy<TResult> WaitAndRetryAsync<TResult>(this PolicyBuilder<TResult> policyBuilder, int retryCount,

It "seems" to exist on WaitAndRetryForeverAsync - but i don't want to wait forever :)

Describe your proposed or preferred solution:

Add a new overload that allows me to examine the result in the sleepdurationprovider :)

Describe any alternative options you've considered:

My workaround is to "hack" it by placing the wait logic inside the onRetry

[martincostello]

Which version of Polly are you using?

This method still exists in the latest release, it's just that the return type is different for async policies now.

Polly/src/Polly/Retry/AsyncRetryTResultSyntax.cs

Lines 652 to 653 in 52968c2

	public static AsyncRetryPolicy<TResult> WaitAndRetryAsync<TResult>(this PolicyBuilder<TResult> policyBuilder, int retryCount,
	Func<int, DelegateResult<TResult>, Context, TimeSpan> sleepDurationProvider, Func<DelegateResult<TResult>, TimeSpan, int, Context, Task> onRetryAsync)

[esbenbach]

I am running on polly 7.1.0. Tried upgrading to 7.2.2. Which does seem to have the mentioned overload. Not really sure why I didnt try that before.

I guess we can just close this again :)