Add support for byte arrays

[dibyendumajumdar]

Ravi has integer arrays and number arrays. In practice integer arrays are almost never needed. However if we had a byte array concept then that could be used to manipulate buffers using bitwise ops.

[bluebear94]

Don't strings already fulfill this role?

[dibyendumajumdar]

not really as it is not possible to access individual elements in a string efficiently