Use random_bytes function if it is available for random number generation #15874
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This is an attempt to use the random_bytes function when generating secure random numbers. This function is included in PHP 7 or through the "paragonie/random_compat" library.
This PR only adds support to use the function if it is available. Changes that can be added is to add a hard dependency on the paragonie/random_compat library, so all current functionality can be deprecated.