feat(EntryFilesAnalyzer): add option to ignore entry file that doesn't exist

[clemgbld]

fix #319

[fraxken]

You also need to update .d.ts here

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 0.00%. Comparing base (6cb745f) to head (3477198).
Report is 143 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff            @@
##           master   #320       +/-   ##
=========================================
- Coverage   98.01%      0   -98.02%     
=========================================
  Files          29      0       -29     
  Lines        1411      0     -1411     
=========================================
- Hits         1383      0     -1383     
+ Misses         28      0       -28     

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[fraxken]

@allcontributors please add @clemgbld for code,test

[allcontributors]

@fraxken

I've put up a pull request to add @clemgbld! 🎉