Support ritsuko's custom variable length string arrays in HDF5.

[LTLA]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 99.24242% with 1 line in your changes missing coverage. Please review.

Project coverage is 96.39%. Comparing base (22b7b7b) to head (c3c38ce).
Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
include/uzuki2/parse_hdf5.hpp	96.42%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #18      +/-   ##
==========================================
+ Coverage   96.14%   96.39%   +0.24%     
==========================================
  Files          19       20       +1     
  Lines        1531     1664     +133     
  Branches       24       25       +1     
==========================================
+ Hits         1472     1604     +132     
  Misses         35       35              
- Partials       24       25       +1     

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