Add all `examples` as regression tests

[codecov[bot]]

Codecov Report

Merging #87 into master will increase coverage by 4.03%. The diff coverage is 76.71%.

@@            Coverage Diff             @@
##           master      #87      +/-   ##
==========================================
+ Coverage   75.72%   79.76%   +4.03%     
==========================================
  Files          24       44      +20     
  Lines        7136     8006     +870     
==========================================
+ Hits         5404     6386     +982     
+ Misses       1732     1620     -112

Impacted Files	Coverage Δ
omas/omas_cocos.py	100% <ø> (ø)	:arrow_up:
omas/examples/parse_codeparameters.py	100% <ø> (ø)
omas/omas_h5.py	87.32% <100%> (+1.02%)	:arrow_up:
omas/omas_setup.py	86.04% <100%> (+1.23%)	:arrow_up:
omas/tests/test_omas_core.py	96.12% <100%> (+0.22%)	:arrow_up:
omas/omas_json.py	83.33% <100%> (+1.75%)	:arrow_up:
omas/tests/__init__.py	100% <100%> (+25%)	:arrow_up:
omas/omas_ds.py	90.32% <100%> (+13%)	:arrow_up:
omas/tests/test_omas_plot.py	99.28% <100%> (+0.56%)	:arrow_up:
omas/tests/test_omas_physics.py	95.81% <100%> (+0.42%)	:arrow_up:
... and 43 more

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