V8 Syntax implementation

[nzdev]

Implements the V8 ResilienceStrategy syntax.

Renamed to CacheStampedeResilienceStrategy to align with strategy naming pattern. Adds telemetry Updates Polly / Test packages

var options = new CacheStampedeResilienceStrategyOptions();
            options.KeyStrategy = overrideKeyStrategy ?? options.KeyStrategy; //optional
            options.LockProvider = overrideLockProvider ?? options.LockProvider; //optional

var pipeline = new ResiliencePipelineBuilder()
                   .AddCacheStampedeResilience(options)
                   .Build();