test: started work on integration tests with cypress (including code coverage)

[ErikBjare]

Apparently, TestCafe doesn't support code coverage. So trying out Cypress, which does.

Mostly just followed https://vuejsdevelopers.com/2020/07/20/code-coverage-vue-cypress/

TODO

• When running npm run test:e2e, process does not exit.
• Doesn't really do any significant testing.
• Doesn't run in CI.
• Combine coverage reports.

[codecov]

Codecov Report

Merging #246 (31f7125) into master (5d51f0d) will increase coverage by 1.11%.
The diff coverage is n/a.

@@            Coverage Diff            @@
##           master    #246      +/-   ##
=========================================
+ Coverage    4.47%   5.59%   +1.11%     
=========================================
  Files          21      21              
  Lines         960     768     -192     
  Branches       92      82      -10     
=========================================
  Hits           43      43              
+ Misses        862     675     -187     
+ Partials       55      50       -5     

Impacted Files	Coverage Δ
src/route.js	0.00% <0.00%> (ø)
src/util/time.js	0.00% <0.00%> (ø)
src/util/color.js	0.00% <0.00%> (ø)
src/store/index.js	0.00% <0.00%> (ø)
src/util/tooltip.js	0.00% <0.00%> (ø)
src/util/awclient.js	0.00% <0.00%> (ø)
src/util/transforms.js	0.00% <0.00%> (ø)
src/store/modules/views.js	0.00% <0.00%> (ø)
src/store/modules/buckets.js	0.00% <0.00%> (ø)
src/visualizations/summary.js	0.00% <0.00%> (ø)
... and 6 more

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