Calculated break duration for Circuit breaker

[atawLee]

Pull Request

The issue or feature being addressed

#653

Details on the issue fix or feature implementation

• Added a FailureCount get property to CircuitBehavior to retrieve the count of failures.
• Introduced a private readonly field _breakDurationGenerator of type Func<int, TimeSpan> to CircuitStateController for dynamic break duration generation.
• Enhanced the constructor of CircuitStateController with an overload to accommodate _breakDurationGenerator.
• Incorporated FailureCount into HealthInfo.
• Updated OpenCircuitFor_NeedsLock to assign the _blockedUntil value based on both the presence of breakDuration and the number of failures.

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

[atawLee]

@dotnet-policy-service agree

[peter-csala]

Please also update the related anti-pattern under the circuit breaker docs.

[martincostello]

Please run the build locally and fix the analyser warnings that are reported to you, such as code formatting issues and the Public API Analyser warnings. Opening the code with Visual Studio should provide you with gestures on the analyzer warnings to automatically update the appropriate files.

[martincostello]

The build is now complaining about not all of the changes' code paths being covered by a test.

You can use the coverage report attached to the build artifacts to take a look at what is missing.