feat(hot): include the changed file in the building event

[bjohansebas]

The compiler's invalid hook reports which file invalidated the compilation. Forward it as an optional file field on the building payload and log it in the client, so users can see what triggered a rebuild.

Ref webpack/webpack-hot-middleware#173

Summary

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Latest commit: 3106727

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 93.46%. Comparing base (ea7115b) to head (3106727).
⚠️ Report is 1 commits behind head on hot-middleware.

Additional details and impacted files

@@                Coverage Diff                 @@
##           hot-middleware    #2352      +/-   ##
==================================================
+ Coverage           93.28%   93.46%   +0.18%     
==================================================
  Files                   4        4              
  Lines                1176     1178       +2     
  Branches              353      354       +1     
==================================================
+ Hits                 1097     1101       +4     
+ Misses                 71       69       -2     
  Partials                8        8              

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