[feat] Add a --junit4-timeout option to specify a hard time limit for tests

[slarse]

Fix #62

[codecov]

Codecov Report

Merging #69 into master will increase coverage by 0.03%.
The diff coverage is 97.29%.

@@            Coverage Diff             @@
##           master      #69      +/-   ##
==========================================
+ Coverage   93.54%   93.58%   +0.03%     
==========================================
  Files           7        7              
  Lines         403      405       +2     
  Branches       59       63       +4     
==========================================
+ Hits          377      379       +2     
+ Misses         16       15       -1     
- Partials       10       11       +1

Impacted Files	Coverage Δ
repobee_junit4/_junit4_runner.py	91.07% <100%> (+0.5%)	⬆️
repobee_junit4/_output.py	97.67% <100%> (+0.73%)	⬆️
repobee_junit4/junit4.py	94.89% <90.9%> (-0.35%)	⬇️

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