feat: add range based exponential buckets in histogram #233
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The current implementation does not have a range based exponential bucket function.
This can be useful in scenarios where the end user doesn't want to perform manual calculations for extracting the required buckets, especially when multiple different ranges are to be used for different histograms.
Similar implementation is provided in the golang client as well.
https://github.com/prometheus/client_golang/blob/5d584e2717ef525673736d72cd1d12e304f243d7/prometheus/histogram.go#L125