load files according to filename suffix

[njzjz]

The current try...catch does not report what's wrong in the YAML file if it is invalid.

[codecov]

Codecov Report

Patch coverage: 51.85% and project coverage change: +0.19 🎉

Comparison is base (84f64dd) 47.63% compared to head (a330e3c) 47.82%.

Additional details and impacted files

@@            Coverage Diff             @@
##            devel    #1255      +/-   ##
==========================================
+ Coverage   47.63%   47.82%   +0.19%     
==========================================
  Files          82       82              
  Lines       14588    14544      -44     
==========================================
+ Hits         6949     6956       +7     
+ Misses       7639     7588      -51     

Impacted Files	Coverage Δ
dpgen/data/reaction.py	0.00% <0.00%> (ø)
dpgen/generator/run.py	66.57% <0.00%> (+0.18%)	⬆️
dpgen/data/gen.py	52.03% <33.33%> (+0.45%)	⬆️
dpgen/data/surf.py	72.16% <33.33%> (+1.59%)	⬆️
dpgen/simplify/simplify.py	22.18% <33.33%> (+0.13%)	⬆️
dpgen/util.py	94.56% <91.66%> (-0.44%)	⬇️

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