feat: add modal to import charts

[betodealmeida]

SUMMARY

This is #11923, which I messed up while rebasing.

BEFORE/AFTER SCREENSHOTS OR ANIMATED GIF

TEST PLAN

ADDITIONAL INFORMATION

• Has associated issue:
• Changes UI
• Requires DB Migration.
• Confirm DB Migration upgrade and downgrade tested.
• Introduces new feature or API
• Removes existing feature or API

[codecov-io]

Codecov Report

Merging #11956 (8b86183) into master (2b9695c) will decrease coverage by 3.94%.
The diff coverage is 70.11%.

@@            Coverage Diff             @@
##           master   #11956      +/-   ##
==========================================
- Coverage   67.70%   63.75%   -3.95%     
==========================================
  Files         938      940       +2     
  Lines       45437    45576     +139     
  Branches     4358     4378      +20     
==========================================
- Hits        30761    29055    -1706     
- Misses      14573    16344    +1771     
- Partials      103      177      +74     

Flag	Coverage Δ
cypress	?
javascript	62.91% <61.83%> (-0.01%)	⬇️
python	64.24% <95.34%> (+0.02%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
...nd/src/views/CRUD/data/dataset/AddDatasetModal.tsx	57.57% <ø> (ø)
...perset-frontend/src/views/CRUD/chart/ChartList.tsx	69.10% <45.00%> (-14.54%)	⬇️
...ontend/src/views/CRUD/data/dataset/DatasetList.tsx	68.58% <61.53%> (-0.65%)	⬇️
...rontend/src/chart/components/ImportModal/index.tsx	65.30% <65.30%> (ø)
...nd/src/datasource/components/ImportModal/index.tsx	65.30% <65.30%> (ø)
superset/charts/commands/importers/v1/__init__.py	93.25% <85.71%> (-0.65%)	⬇️
...uperset/datasets/commands/importers/v1/__init__.py	92.20% <85.71%> (-0.65%)	⬇️
superset/charts/api.py	80.53% <100.00%> (+0.06%)	⬆️
superset/charts/commands/importers/dispatcher.py	80.64% <100.00%> (+1.33%)	⬆️
superset/charts/schemas.py	100.00% <100.00%> (ø)
... and 185 more

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[hughhhh]

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