Add Clifford simulator implementation

[speller26]

Describe the feature you'd like Stabilizer circuits can be classically simulated efficiently, and are very useful in quantum information research, for example in quantum error correction. To support these use cases, it would be good to have a Clifford simulator target for the local simulator:

sim = LocalSimulator("braket.clifford")

This should be done by implementing the OpenQASMSimulator interface to translated OpenQASM into simulator instructions.

How would this feature be used? Please describe. Fast simulation of large stabilizer circuits, for example with thousands of qubits and gates.