Match getRandomValues to spec

[mmmoussa]

The API specification for Crypto.getRandomValues says the following for its input paremeter:

An integer-based TypedArray, that is one of: Int8Array, Uint8Array, Uint8ClampedArray, Int16Array, Uint16Array, Int32Array, Uint32Array, BigInt64Array, BigUint64Array (but not Float32Array nor Float64Array). All elements in the array will be overwritten with random numbers.

This library currently has the following issues:

• The type of the input argument is incorrect
• The elements in the array are not overwritten with the random numbers

We recently had this discrepancy break functionality in another library because of not matching the API. This PR makes this library match the API specification.