Can't Reset BucketHistograms from the MetricsRoot object

[zcassels3]

The DefaultMetricsProvider accessible from MetricsRoot doesn't expose HistogramBuckets. This prevents the 'Reset()' operation to be used for HistogramBuckets much like the other metric types.

https://github.com/AppMetrics/AppMetrics/blob/main/src/Core/src/App.Metrics.Core/Internal/DefaultMetricsProvider.cs
.. doesn't have HistogramBuckets

Here is an example of a gauge being updated then reset. The measurement options are exposed using the Measure property and the 'Reset()' function is exposed through the provider.

var _gaugeOptions = new App.Metrics.Gauge.GaugeOptions
{
    Context = 'app',
    Name = 'my_gauge'
};
_root.Measure.Gauge.SetValue(_gaugeOptions, 10);
...
_root.Provider.Gauge.Instance(_gaugeOptions).Reset();

In the example of the BucketHistogram, the provider doesn't have an option to reset the object in the registry.

var histogramOptions = new App.Metrics.BucketHistogram.BucketHistogramOptions
{
    Context = 'app',
    Name = 'my_histogram',
    Buckets = new List<double> { 1, 10, 100, 1000, 2000, 5000 }
};
_root.Measure.BucketHistogram.Update(_histogramOptions, 100);
_root.Measure.BucketHistogram.Update(_histogramOptions, 5555);
...
// this option doesn't exist!
_root.Provider.BucketHistogram.Instance(_histogramOptions).Reset();

The IBucketHistogram is a IResetableMetric so it seems like this should be a legal operation.

Thanks!