[Fix] Forward custom amplitude_min through eda_process (#1197)

[SyedAshhadIbrar]

Description

Fixes #1197.

eda_process() advertised **kwargs forwarding but then called eda_peaks(..., amplitude_min=0.1, **kwargs_peaks). The hardcoded keyword always won, and a custom amplitude_min never reached peak detection. eda_methods() also stored user kwargs under a nested "kwargs" key, so get_kwargs() could not pick them up (unlike rsp_methods(), which unpacks **kwargs into report_info).

The default remains 0.1 — that value still lives on eda_peaks() — but callers can now do:

signals, info = nk.eda_process(eda, sampling_rate=250, amplitude_min=0.03)

amplitude_min is a relative threshold (fraction of the largest SCR), not an absolute conductance in siemens.

Proposed Changes

• Unpack user kwargs in eda_methods() the same way rsp_methods() does.
• Stop hardcoding amplitude_min=0.1 in eda_process(); let eda_peaks() supply the default.
• Document amplitude_min on eda_process().
• Add a regression test that the kwarg is forwarded and changes detected peak counts.
• Note the fix in NEWS.rst.

Checklist

• I have read the CONTRIBUTING file.
• My PR is targeted at the dev branch (and not towards the master branch).
• I ran the CODE CHECKS on the files I added or modified and fixed the errors.
• I have added the newly added features to News.rst (if applicable)

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 58.18%. Comparing base (9f3a1a5) to head (53d85d2).

Additional details and impacted files

@@           Coverage Diff           @@
##              dev    #1203   +/-   ##
=======================================
  Coverage   58.17%   58.18%           
=======================================
  Files         310      310           
  Lines       15702    15702           
=======================================
+ Hits         9135     9136    +1     
+ Misses       6567     6566    -1     

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