"Public Visual Datasets" feature, a.k.a. "Fetal MRI Viewer"

[jennydaman]

The "Visual Datasets" feature introduced in this PR, a.k.a. the "Fetal MRI Viewer", is a new view in ChRIS_ui. It can be accessed from the sidebar. It uses niivue-react (written by me) to visualize datasets found in public feeds.

Currently, our goals are to push out this MVP. I plan to overhaul the "Visual Datasets specification" and rework the "Visual Datasets Viewer" as well in the near future.

Closes #1023

[codecov-commenter]

Codecov Report

Attention: 256 lines in your changes are missing coverage. Please review.

Comparison is base (94ba0d2) 23.86% compared to head (e226f6d) 23.06%.

Files	Patch %	Lines
src/components/VisualDatasets/client.tsx	6.49%	72 Missing ⚠️
src/components/VisualDatasets/index.tsx	1.72%	57 Missing ⚠️
...ts/VisualDatasets/components/SizedNiivueCanvas.tsx	3.22%	30 Missing ⚠️
...s/VisualDatasets/components/NiivueOptionsPanel.tsx	5.26%	18 Missing ⚠️
...ts/VisualDatasets/components/SliceTypeDropdown.tsx	11.76%	15 Missing ⚠️
...alDatasets/components/SelectedFilesOptionsPane.tsx	7.69%	12 Missing ⚠️
...nts/VisualDatasets/components/ColormapDropdown.tsx	21.42%	11 Missing ⚠️
...nts/VisualDatasets/components/DragModeDropdown.tsx	21.42%	11 Missing ⚠️
src/components/VisualDatasets/associatedOptions.ts	0.00%	10 Missing ⚠️
src/components/VisualDatasets/helpers.ts	0.00%	8 Missing ⚠️
... and 3 more

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1043      +/-   ##
==========================================
- Coverage   23.86%   23.06%   -0.80%     
==========================================
  Files         170      184      +14     
  Lines        5795     6073     +278     
  Branches     1253     1306      +53     
==========================================
+ Hits         1383     1401      +18     
- Misses       4315     4573     +258     
- Partials       97       99       +2     

Flag	Coverage Δ
e2etests	23.06% <8.24%> (-0.80%)	⬇️

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[PintoGideon]

@jennydaman Inspiring work !!