Quadrature methods for circuit components and states

[elib20]

Context: We would like convenience methods for evaluating the quadrature basis representation of circuit components and states.

Description of the Change:

• renames the quadrature method for circuit components to quadrature_triple
• adds a new quadrature method for circuit components with 1 or 2 wires to evaluate the quadrature basis function over an array of points. This works for Bargmann and Fock representations, batched or unbatched.
• adds a new quadrature_distribution method for Ket and DM to evaluate the quadrature basis probability distribution over an array of points. This works for Bargmann and Fock representations, batched or unbatched.

Benefits:

• Convenient methods for users
• Quadrature methods now work for Fock representation

Possible Drawbacks:

• Only 1 and 2 wire objects for now

Related GitHub Issues: