[Feature] Allow time-dependent duration to be passed at runtime

[jpmoutinho]

Following the MR on PyQTorch pasqal-io/pyqtorch#291, this MR brings this feature to Qadence as well.

from qadence import X, HamEvo, PI, add, run
from qadence import TimeParameter
import torch

n_qubits = 3

# Time-dependent Hamiltonian
t = TimeParameter("t")
hamiltonian = t * add(X(i) for i in range(n_qubits))
hevo = HamEvo(hamiltonian, parameter=t)
state = run(hevo, values = {"duration": torch.tensor(1.0)})

Note that I made it so there is a default duration = FeatureParameter("duration")

[vytautas-a]

Everything seems ok