ci: Add tests for LHEEventInfo, LHEParticle, LHEFile classes

[eduardo-rodrigues]

This is all trivial at this point but is a start. It does add coverage few a few lines untested so far.

* Remove loads from API.
* Add RuntimeError message if field names are missing.
* Add tests for LHEEventInfo, LHEParticle, LHEFile classes.

[eduardo-rodrigues]

The CI failures have to do with what PR #103 fixes. I will rebase as soon as the latter goes in, no worries.

[matthewfeickert]

There's a pre-commit conflict here between isort and black. I can fix that in another PR with adding a profile for isort to let it know about black.

[matthewfeickert]

LGTM. 👍 Thanks @eduardo-rodrigues!

CI is failing for known reasons which I mentioned and will fix later.

[codecov]

Codecov Report

Base: 60.28% // Head: 67.30% // Increases project coverage by +7.02% 🎉

Coverage data is based on head (572aaf3) compared to base (48f528e).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #136      +/-   ##
==========================================
+ Coverage   60.28%   67.30%   +7.02%     
==========================================
  Files           2        2              
  Lines         209      208       -1     
  Branches       56       56              
==========================================
+ Hits          126      140      +14     
+ Misses         73       62      -11     
+ Partials       10        6       -4     

Flag	Coverage Δ
unittests-3.10	67.30% <100.00%> (+8.45%)	⬆️
unittests-3.6	?

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

Impacted Files	Coverage Δ
src/pylhe/__init__.py	74.26% <100.00%> (+8.57%)	⬆️
src/pylhe/awkward.py	35.13% <0.00%> (ø)

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