Add test matrix generator

[cgewecke]

#430

[codecov-io]

Codecov Report

Merging #593 (8c4832b) into experimental-options (56c0c8d) will decrease coverage by 1.05%.
The diff coverage is 80.59%.

@@                   Coverage Diff                    @@
##           experimental-options     #593      +/-   ##
========================================================
- Coverage                 99.09%   98.04%   -1.06%     
========================================================
  Files                        22       23       +1     
  Lines                      1109     1174      +65     
========================================================
+ Hits                       1099     1151      +52     
- Misses                       10       23      +13     

Impacted Files	Coverage Δ
plugins/resources/nomiclabs.ui.js	100.00% <ø> (ø)
plugins/resources/matrix.js	43.47% <43.47%> (ø)
lib/api.js	100.00% <100.00%> (ø)
plugins/hardhat.plugin.js	97.91% <100.00%> (+0.04%)	⬆️
plugins/resources/nomiclabs.utils.js	98.75% <100.00%> (+0.10%)	⬆️
plugins/resources/plugin.utils.js	97.77% <100.00%> (+0.13%)	⬆️
plugins/resources/truffle.utils.js	100.00% <100.00%> (ø)
plugins/truffle.plugin.js	100.00% <100.00%> (ø)

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