Initializes a Count-Min Sketch to accommodate requested tolerances.
key: The name of the sketch.
error: Estimate size of error. The error is a percent of total counted
items. This effects the width of the sketch.
probability: The desired probability for inflated count. This should
be a decimal value between 0 and 1. This effects the depth of the sketch.
For example, for a desired false positive rate of 0.1% (1 in 1000),
error_rate should be set to 0.001. The closer this number is to zero, the
greater the memory consumption per item and the more CPU usage per operation.