support HDF5 files as initial data system

[njzjz]

"init_data_sys": [
   "123/456/789.hdf5"
]

[codecov-commenter]

Codecov Report

Base: 38.40% // Head: 38.89% // Increases project coverage by +0.48% 🎉

Coverage data is based on head (937f643) compared to base (1e03bb9).
Patch coverage: 96.00% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##            devel     #973      +/-   ##
==========================================
+ Coverage   38.40%   38.89%   +0.48%     
==========================================
  Files          99       99              
  Lines       17942    17948       +6     
==========================================
+ Hits         6891     6981      +90     
+ Misses      11051    10967      -84     

Impacted Files	Coverage Δ
dpgen/simplify/simplify.py	0.00% <ø> (ø)
dpgen/util.py	90.00% <90.90%> (-0.91%)	⬇️
dpgen/generator/arginfo.py	100.00% <100.00%> (ø)
dpgen/generator/run.py	64.47% <100.00%> (+2.57%)	⬆️
dpgen/simplify/arginfo.py	100.00% <100.00%> (ø)
dpgen/dispatcher/Dispatcher.py	40.54% <0.00%> (+5.01%)	⬆️

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