Drop simple circuit breaker

[martintmk]

Details on the issue fix or feature implementation

Per the API review at #1233:

• Drops SimpleCircuitBreaker
• AdvancedCircuitBreaker renamed to CircuitBreaker

Contributes to #1301

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

Merging #1444 (08f27aa) into main (a51b44d) will decrease coverage by 0.07%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main    #1444      +/-   ##
==========================================
- Coverage   83.94%   83.87%   -0.07%     
==========================================
  Files         276      273       -3     
  Lines        6533     6505      -28     
  Branches     1013     1010       -3     
==========================================
- Hits         5484     5456      -28     
  Misses        840      840              
  Partials      209      209              

Flag	Coverage Δ
macos	83.87% <100.00%> (-0.07%)	⬇️
windows	83.87% <100.00%> (-0.07%)	⬇️

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

Files Changed	Coverage Δ
...lly.Core/CircuitBreaker/CircuitBreakerConstants.cs	100.00% <ø> (ø)
...rcuitBreakerResilienceStrategyBuilderExtensions.cs	100.00% <100.00%> (ø)
...Core/CircuitBreaker/CircuitBreakerStateProvider.cs	100.00% <100.00%> (ø)
...itBreaker/CircuitBreakerStrategyOptions.TResult.cs	100.00% <100.00%> (ø)
...rcuitBreaker/Controller/AdvancedCircuitBehavior.cs	100.00% <100.00%> (ø)

[martincostello]

Suggested change

	/// Gets or sets the failure threshold at which the circuit will break.
	/// Gets or sets the failure-to-success ratio at which the circuit will break.