npy: first stab at a n-dim array with support for ragged-arrays

[sbinet]

Fixes #20.

[codecov-commenter]

Codecov Report

Attention: 270 lines in your changes are missing coverage. Please review.

Comparison is base (b2755b4) 57.86% compared to head (aa17140) 60.99%.
Report is 3 commits behind head on main.

❗ Current head aa17140 differs from pull request most recent head 7797a3e. Consider uploading reports for the commit 7797a3e to get more accurate results

Files	Patch %	Lines
npy/descr.go	63.80%	132 Missing and 28 partials ⚠️
npy/reader.go	36.36%	9 Missing and 33 partials ⚠️
npy/array.go	77.85%	26 Missing and 5 partials ⚠️
npy/pickle.go	73.33%	12 Missing and 4 partials ⚠️
npy/float16/float16.go	72.97%	10 Missing ⚠️
npy/npy.go	47.05%	9 Missing ⚠️
dump.go	60.00%	1 Missing and 1 partial ⚠️

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Additional details and impacted files

@@            Coverage Diff             @@
##             main      #22      +/-   ##
==========================================
+ Coverage   57.86%   60.99%   +3.13%     
==========================================
  Files           8       12       +4     
  Lines        1571     2297     +726     
==========================================
+ Hits          909     1401     +492     
- Misses        513      707     +194     
- Partials      149      189      +40     

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