Save number of acquired data points in config wave

[MichaelHuth]

Currently we save the number of points (to be) acquired in the stopCollectionPoint global.

There is insufficient after Sutter hardware support gets introduced, where the DAC and ADC sample rate can differ and thus, the number of acquired points depend on the channel type.

It would be convenient to add the per channel "number of points to be acquired" in the config wave as additional column. Then the data storage would be the same for every hardware. At the moment for NI/SU the number is determined through the size of the data wave of the specific channel.