Describe the new feature or enhancement

Each neuralynx .ncs file has a header with acquisition metadata (example below). Right now, read_raw_neuralynx() doesn't propagate any of that metadata downstream (e.g. in raw.info), other than sampling frequency (example below).

It seems to me, read_raw_neuralynx() could preserve the time of acquisition (--TimeCreated key in header) and any information about online filters if those were applied (--DSP* keys in header).

I'm happy to do this, but would need some guidance on which information from header would be useful to include and what the best way of doing so would be.

Describe your proposed implementation

Certain header properties can vary across .ncs channels (I think sampling freq, possibly also DSP params). So if any header information is to be included upon reading the dataset, it will first be checked that the property common across selected channels.

Describe possible alternatives

Not sure what alternatives would be here.

Additional context

Current raw.info

from mne.io import read_raw_neuralynx
from mne.datasets.testing import data_path

testing_path = data_path(download=False) / "neuralynx"
fname_patterns = ["*u*.ncs", "*3_gaps.ncs"]
raw = read_raw_neuralynx(fname=testing_path, preload=True, exclude_fname_patterns=fname_patterns)
raw.info

Out[1]: 
<Info | 7 non-empty values
 bads: []
 ch_names: LAHC1, LAHC2, LAHC3, xAIR1, xEKG1
 chs: 5 sEEG
 custom_ref_applied: False
 highpass: 0.0 Hz
 lowpass: 1000.0 Hz
 meas_date: unspecified
 nchan: 5
 projs: []
 sfreq: 2000.0 Hz
>

Example header (LAHC1.ncs)

######## Neuralynx Data File Header
-FileType NCS
-FileVersion 3.4
-FileUUID 663100aa-dc63-4458-8e21-80667b048cf5
-SessionUUID c6e1f50d-ff9c-40e4-9b9a-b43f627c74c8
-ProbeName
-OriginalFileName "E:\kristijan\2023-11-02_13-39-27\LAHC1.ncs"
-TimeCreated 2023/11/02 13:39:27
-TimeClosed 2023/11/02 13:42:05

-RecordSize 1044
-ApplicationName Pegasus "2.1.3 "
-AcquisitionSystem AcqSystem1 ATLAS
-ReferenceChannel "Source 01 Reference 1"
-SamplingFrequency 2000
-ADMaxValue 32767
-ADBitVolts 0.000000305175781250000006
-AcqEntName LAHC1
-NumADChannels 1
-ADChannel 8
-InputRange 10000
-InputInverted True

-DSPLowCutFilterEnabled True
-DspLowCutFrequency 0.1
-DspLowCutNumTaps 0
-DspLowCutFilterType DCO
-DSPHighCutFilterEnabled True
-DspHighCutFrequency 500
-DspHighCutNumTaps 256
-DspHighCutFilterType FIR
-DspDelayCompensation Enabled
-DspFilterDelay_<B5>s 3984