Pass kwargs from ecg_process to ecg_clean

[atpage]

Description

ecg_clean() accepts powerline as a kwarg, which gets passed down to signal_filter(). However, the ecg_process() wrapper that calls ecg_clean() does not accept or pass kwargs, including powerline.

This patch is an extension of the work in Issue #610. It enables passing kwargs to ecg_clean() from a higher level, namely ecg_process().

[DerAndereJohannes]

Thanks atpage for the pull request! Using this

I checked the branch using the following code:

import neurokit2 as nk
import matplotlib.pyplot as plt

ecg = nk.ecg_simulate(duration=10, sampling_rate=1000)

noise = nk.signal_simulate(frequency=60, amplitude=0.2)

noisy_ecg = ecg + noise

signals, info = nk.ecg_process(noisy_ecg, powerline=60)

nk.signal_plot(signals["ECG_Clean"])

plt.show()

and it seems to work well. The failed checks on this branch come from a different reason, so I will merge it into dev.