Improve get_state functionality

[zohimchandani]

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Describe the bug

import cudaq 

kernel = cudaq.make_kernel()

qubits = kernel.qalloc(2)

kernel.x(qubits[0])
kernel.x(qubits[0])

state = cudaq.get_state(kernel)

state.dump()

1+0j 0+0j 0+0j 0+0j 

The code above dumps the state but the output can't be manipulated as it does not have a type. I suggest it be dictionary where the keys are the basis states and the values are the complex amplitudes.

Moreover, it is not clear that the basis state ordering starts from the 11 state. A dictonary key value mapping would solve that too.

Steps to reproduce the bug

NA

Expected behavior

NA

Is this a regression? If it is, put the last known working version (or commit) here.

Not a regression

Environment

Suggestions

No response

[zohimchandani]

The issue of manipulating the coefficients can be solved by this:

import cudaq 
import numpy as np 

kernel = cudaq.make_kernel()

qubits = kernel.qalloc(2)

kernel.x(qubits[0])
kernel.x(qubits[0])

state = cudaq.get_state(kernel)

npa = np.array(state)

however the labelling of the basis states still remains and I suggest a dictionary style structure to represent this information.

[bettinaheim]

addressed by #1107