Add configurable test timeouts

[corymharper]

This pull request adds configurable timeouts with an initial timeout of the test command for thirty seconds.

Closes #61

[codecov]

Codecov Report

Merging #73 (fad09ea) into master (f649bbd) will decrease coverage by 0.19%.
The diff coverage is 80.00%.

@@            Coverage Diff             @@
##           master      #73      +/-   ##
==========================================
- Coverage   94.16%   93.96%   -0.20%     
==========================================
  Files          12       12              
  Lines         394      398       +4     
  Branches       65       64       -1     
==========================================
+ Hits          371      374       +3     
- Misses         23       24       +1     

Impacted Files	Coverage Δ
src/utils/get-config.ts	92.42% <75.00%> (-1.13%)	⬇️
src/steps/test-projects.ts	100.00% <100.00%> (ø)

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