This adds checks to all functions in FuzzedDataProvider that accept a parameter that could be used as the number of bytes to pull from the fuzzed data. If any length value is not a whole number, the function will throw an error to prevent dataPtr from ending up a non-whole number. I chose this over having it do a Math.floor and continuing to make clear what's going on.

The crashes we were seeing were due to consumeNumberInRange returning a non-integer value, consumeString would accept that value as the length of the string to get and would set this.dataPtr and this._remainingBytes as a direct calculation based off of the length given. I'm not sure what this.data.toString does with the floating value but it successfully returned something so this call would work. The next call to consumeNumberInRange would end up trying to index this.data with this.dataPtr + <some other number> and the end result was this.data[<a non-integer value>] which JS will deal with by returning undefined.