extend pad_to to pad_to_all_atomic_subtemplates

[Nomos11]

to increase convenience even more, the pad_to could be called from the top-level-pt to extend all atomic subtemplates to adhere to awg-specifications.
This is e.g. outlined in branch feat/linspace_measurements and should be simple to implement

qupulse/qupulse/pulses/pulse_template.py

Line 442 in 6facb1f

def pad_all_atomic_subtemplates_to(self,

Potentially for 1.0?
In that regard however, the PT time-extended in this manner should by default be translated into a single waveform, otherwise the convenience gets lost again.