preprocessing: improved support for adjast time length

[r9y9]

• support for 1d array
• support kwargs passed to np.pad

[codecov-io]

Codecov Report

Merging #63 into master will decrease coverage by 0.63%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master      #63      +/-   ##
==========================================
- Coverage   85.55%   84.91%   -0.64%     
==========================================
  Files          31       31              
  Lines        1751     1677      -74     
==========================================
- Hits         1498     1424      -74     
  Misses        253      253

Impacted Files	Coverage Δ
nnmnkwii/preprocessing/generic.py	99.43% <100%> (-0.17%)	⬇️

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