support exp gate for circuit drawer

[Jacomichi]

Change

Support ParametricExpGate by plot_quantum_circuit.

Description

I have fixed plot_quantum_circuit since ParametricExpGate could not be displayed.

Sample

import qamomile.core.operator as qm_o
import qamomile.core.circuit as qm_c
from qamomile.core.circuit.drawer import plot_quantum_circuit

hamiltonian = qm_o.Hamiltonian()
hamiltonian += 5.0 * qm_o.X(0) * qm_o.Z(3) -4 * qm_o.Y(0) * qm_o.Y(1)
qc = qm_c.QuantumCircuit(5)
theta = qm_c.Parameter(r"\theta")
qc.exp_evolution(theta,hamiltonian)
hamiltonian = qm_o.Hamiltonian()
hamiltonian += -qm_o.X(2) * qm_o.Z(4) -  qm_o.Y(2) * qm_o.Y(4)
qc.exp_evolution(theta,hamiltonian)

plot_quantum_circuit(qc)