Add rawFile in the file like object

[gabskoro]

Sometimes you need more info about the uploaded file and it would be ok to have the rawFile in the fileLikeObject when setting a custom filter.

I need it to get the image width and height, that's why I needed promise support #648

[codecov-io]

Codecov Report

Merging #649 into development will increase coverage by 17.73%.
The diff coverage is 0%.

@@               Coverage Diff                @@
##           development     #649       +/-   ##
================================================
+ Coverage        33.08%   50.81%   +17.73%     
================================================
  Files               10       10               
  Lines              547      549        +2     
  Branches            70       74        +4     
================================================
+ Hits               181      279       +98     
+ Misses             363      269       -94     
+ Partials             3        1        -2

Impacted Files	Coverage Δ
src/file-upload/file-like-object.class.ts	45% <0%> (+13.42%)	⬆️
src/file-upload/file-item.class.ts	27.27% <0%> (+5.05%)	⬆️
scripts/matchers.ts	57.14% <0%> (+14.28%)	⬆️
src/file-upload/file-uploader.class.ts	40.6% <0%> (+15.41%)	⬆️
src/file-upload/file-type.class.ts	53.84% <0%> (+30.76%)	⬆️
src/file-upload/file-select.directive.ts	95.45% <0%> (+40.9%)	⬆️
src/file-upload/file-drop.directive.ts	87.03% <0%> (+49.3%)	⬆️

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