feat: more homogeneous usage of ParseError

[eduardo-rodrigues]

I noticed that the read_lhe type of functions and others, which parse the XML, do not all catch parsing errors. This PR makes things more homogeneous. Note that

1. On purpose I am not trying here to deal with test coverage of these parsing errors. That's something to be done with a dedicated PR and will require a special LHE file, if not several.
2. We should discuss at some point if parsing errors should raise errors or be dealt with smoothly, as now, with print statements. Again, I think it is better to make any modification to the way these errors are dealt with homogeneously across the various methods.

[codecov]

Codecov Report

Base: 68.07% // Head: 67.28% // Decreases project coverage by -0.79% ⚠️

Coverage data is based on head (1e0bcf4) compared to base (e7faf40).
Patch coverage: 50.00% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #141      +/-   ##
==========================================
- Coverage   68.07%   67.28%   -0.80%     
==========================================
  Files           2        2              
  Lines         213      217       +4     
  Branches       57       57              
==========================================
+ Hits          145      146       +1     
- Misses         61       64       +3     
  Partials        7        7              

Flag	Coverage Δ
unittests-3.10	65.89% <50.00%> (-0.77%)	⬇️
unittests-3.6	64.62% <50.00%> (-0.77%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
src/pylhe/__init__.py	73.88% <50.00%> (-1.12%)	⬇️

Help us with your feedback. Take ten seconds to tell us how you rate us. Have a feature suggestion? Share it here.

☔ View full report at Codecov.
📢 Do you have feedback about the report comment? Let us know in this issue.

[eduardo-rodrigues]

This is ready given the scope, see description. Merging as I have tests in the pipeline to be added.