GPU Support for QuantumClifford.jl

QuantumClifford.jl is a package designed for simulating Quantum Clifford circuits, circuits that consist of Clifford gates. QuantumClifford.jl can be highly useful for designing Quantum error-correcting codes. Since applying Clifford gates to Stabilizer states is mathematically similar to Linear Algebraic operations, we can utilize GPU to parallelize the process and make it significantly faster. This Summer of Code project consists of implementing the aforementioned Clifford gate operations in GPU kernels, and then seamlessly integrating them into the rest of the QuantumClifford library.