feat(app): Implement search facets for DatasetType field

[nellh]

Adds a dataset type selection to the search UI.

[codecov]

Codecov Report

Attention: Patch coverage is 29.09091% with 39 lines in your changes are missing coverage. Please review.

Project coverage is 42.48%. Comparing base (059e3b5) to head (5523972).
Report is 5 commits behind head on master.

Files	Patch %	Lines
.../src/scripts/search/inputs/dataset-type-select.tsx	24.24%	25 Missing ⚠️
...nneuro-components/src/search-page/FiltersBlock.tsx	8.33%	11 Missing ⚠️
...neuro-app/src/scripts/search/search-params-ctx.tsx	0.00%	2 Missing ⚠️
...nneuro-app/src/scripts/search/search-container.tsx	50.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3036      +/-   ##
==========================================
- Coverage   42.50%   42.48%   -0.03%     
==========================================
  Files         600      601       +1     
  Lines       37906    37969      +63     
  Branches     1111     1113       +2     
==========================================
+ Hits        16112    16131      +19     
- Misses      21578    21622      +44     
  Partials      216      216              

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