add (3,2)-QRAO

[Jacomichi]

Change

I have implemented Space Efficient QRAO.
And, add __sub__ for Hamiltonian

Example

import jijmodeling as jm
import jijmodeling_transpiler.core as jmt
from qamomile.core.converters.qrao.qrao32 import QRAC32Converter

problem = jm.Problem("sample")
x = jm.BinaryVar("x", shape = (3,))
problem += x[1] * x[2] + x[0]
compiled_instance = jmt.compile_model(problem, {})

converter = QRAC32Converter(compiled_instance)
cost_hamiltonian = converter.get_cost_hamiltonian()
pauli_list = converter.get_encoded_pauli_list()