feat: file upload

[bitpshr]

Type: feature

The following has been addressed in the PR:

• [x] There is a related issue
• [x] All code matches the style guide
• [x] Unit tests are included in the PR
• [x] For new widgets, an entry has been added to the .dojorc
• [x] For new widgets, theme.variant() is added to the root domnode
• [x] Any widget variant uses theme.compose like this
• [x] WidgetProperties are exported

Description:

This pull request introduces two new widgets to help support file uploads, FileUploadInput for simple uploads, and FileUploader for more complex upload management.

Resolves #1129 Replaces #1540

Preview

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[codecov[bot]]

Codecov Report

Merging #1749 (2c345ba) into master (7c8e49e) will decrease coverage by 0.14%. The diff coverage is 84.84%.

@@            Coverage Diff             @@
##           master    #1749      +/-   ##
==========================================
- Coverage   90.46%   90.32%   -0.15%     
==========================================
  Files          94       98       +4     
  Lines        5152     5284     +132     
  Branches     1406     1445      +39     
==========================================
+ Hits         4661     4773     +112     
- Misses        241      250       +9     
- Partials      250      261      +11     

Impacted Files	Coverage Δ
src/file-upload-input/index.tsx	80.00% <80.00%> (ø)
src/file-uploader/index.tsx	86.36% <86.36%> (ø)
src/file-upload-input/nls/FileUploadInput.ts	100.00% <100.00%> (ø)
src/file-uploader/nls/FileUploader.ts	100.00% <100.00%> (ø)

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[msssk]

Why was DnD dropped? That seems like a key feature of a file upload widget.

I don't see that .dojorc was updated - if this is no longer necessary we should remove it from our PR template.

[bitpshr]

@msssk I chose to remove drag-and-drop for this first version of the file upload components since it adds a lot of complexity. I agree that it's a nice to have feature (though getting less common in practice) but I don't think it's required to accomplish the end goal of uploading files and managing them.

[agubler]

@bitpshr there seems to be typescript errors