Introduce RetryStrategyOptions.MaxDelay property

[martintmk]

Details on the issue fix or feature implementation

Closes #1605

Usage:

new ResiliencePipelineBuilder().AddRetry(new RetryStrategyOptions
{
  MaxRetryAttempts = int.MaxValue,
  BackoffType = DelayBackoffType.Exponential,
  UseJitter = true,
  MaxDelay = TimeSpan.FromHours(1), // max delay is one hour
});

Additional changes:

• Changed how jitter is applied. It is not only additive now, but it can also decrease the value.

Confirm the following

• I started this PR by branching from the head of the default branch
• I have targeted the PR to merge into the default branch
• I have included unit tests for the issue/feature
• I have successfully run a local build

[codecov]

Codecov Report

Patch coverage: 100.00% and project coverage change: +0.02% 🎉

Comparison is base (a511f53) 84.63% compared to head (17a20e5) 84.65%.
Report is 7 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1620      +/-   ##
==========================================
+ Coverage   84.63%   84.65%   +0.02%     
==========================================
  Files         306      306              
  Lines        6820     6829       +9     
  Branches     1044     1045       +1     
==========================================
+ Hits         5772     5781       +9     
  Misses        839      839              
  Partials      209      209              

Flag	Coverage Δ
linux	?
macos	84.65% <100.00%> (+0.02%)	⬆️
windows	84.65% <100.00%> (+0.02%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files Changed	Coverage Δ
src/Polly.Core/Retry/RetryHelper.cs	100.00% <100.00%> (ø)
src/Polly.Core/Retry/RetryResilienceStrategy.cs	100.00% <100.00%> (ø)
...c/Polly.Core/Retry/RetryStrategyOptions.TResult.cs	100.00% <100.00%> (ø)

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[martincostello]

Did this addition get documented in a subsequent PR?

[martintmk]

Did this addition get documented in a subsequent PR?

#1631