Keep track of the LFP sampling rate in /processing/ecephys/LFP/ElectricalSeries/starting_time.rate

[pickles-bread-and-butter]

Again, this is really a feature of that data, not of the neuropixel probe. You choose when you downsample what the resulting rate should be, so it is very feasible to have different LFP sampling rates for the same probe.

AllenSDK/allensdk/brain_observatory/ecephys/nwb/AIBS_ecephys_extension.yaml

Lines 19 to 21 in a040661

	- name: lfp_sampling_rate
	dtype: float64
	doc: the (probably reduced) sampling rate at which lfp data were acquired on this probe's channels

Split off from: #1330

[njmei]

A closer look at this issue suggests that this is in fact a duplicate of #1421. Closing this issue.