Add sample notebooks

[idavis]

This PR adds sample Python integration and resource estimation notebooks for OpenQASM. There is more here than just those changes as existing external issues require workarounds.

• Qiskit and existing OpenQASM code incorrectly specify 0 for angles which isn't allowed in the spec. So this PR adds the ability to cast literals to angles with a value of 0 for compatibility. This also removes some casting calls as we can now directly create the angle from the literal.
• There is a util bitstring function which allows the user to specify that they want the output of simulation to be converted into a bitstring if any of the outputs are bit registers. This matches what Qiskit output would be like. For the moment the code defaults to Q#'s typically output rendering.
• The old parser couldn't handle gates, but with the new parser we don't have to fully transpile into the Q# canonical gates. This changes the resource estimation numbers.

[swernli]

This works fine, but why not use the callable object like the other samples? I think there was a bug previously where this didn't work as expected, but now it seems to work just fine.

Suggested change

	"Histogram(run(\"bell()\", shots=1000, noise=DepolarizingNoise(0.01)))"
	"Histogram(run(bell, shots=1000, noise=DepolarizingNoise(0.01)))"

[idavis]

The text above this line talks about how to call it just like you would in a %%qsharp cell. We can change this but we need to update more for consistency.