Make test timeout dynamic (#21)

[k3rn31]

Now test timeout is based on the time it takes to gather the coverage, multiplied by 2. I added a coefficient of 2 not to be too strict with the timeouts and generate false positives. I don't know if it makes sense to have it configurable, considering that it should be an int.

[codecov]

Codecov Report

Merging #45 (bf619f7) into main (1cccabe) will decrease coverage by 0.05%.
The diff coverage is 100.00%.

❗ Current head bf619f7 differs from pull request most recent head 7251898. Consider uploading reports for the commit 7251898 to get more accurate results

@@            Coverage Diff             @@
##             main      #45      +/-   ##
==========================================
- Coverage   86.54%   86.49%   -0.06%     
==========================================
  Files          10       10              
  Lines         513      511       -2     
==========================================
- Hits          444      442       -2     
  Misses         54       54              
  Partials       15       15              

Flag	Coverage Δ
unittests	86.49% <100.00%> (-0.06%)	⬇️

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Impacted Files	Coverage Δ
coverage/coverage.go	100.00% <100.00%> (ø)
mutator/mutator.go	87.90% <100.00%> (-0.10%)	⬇️
log/log.go	92.10% <0.00%> (-0.76%)	⬇️
cmd/gremlins/main.go	50.00% <0.00%> (ø)

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