add Switzerland to country selection

[Caahlo]

add Switzerland to country selection and document Swiss cantons as regions

CATEGORY

Choose one

• Bug Fix
• Enhancement (new features, refinement)
• Refactor
• Add tests
• Build / Development Environment
• Documentation

SUMMARY

Add Switzerland to the documentation and to the country map drop-down menu
requires: apache-superset/superset-ui-plugins#260

BEFORE/AFTER SCREENSHOTS OR ANIMATED GIF

TEST PLAN

1. Go to the charts list
2. Click on the "Birth in France by department in 2016" link
3. under "Options" in the "Country Name" drop-down menu, select "Switzerland"

Expected

The borders of the cantons of switzerland should appear in pale gray.

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

REVIEWERS

[codecov-io]

Codecov Report

Merging #8592 into master will not change coverage.
The diff coverage is n/a.

@@          Coverage Diff           @@
##           master   #8592   +/-   ##
======================================
  Coverage    66.5%   66.5%           
======================================
  Files         450     450           
  Lines       23120   23120           
  Branches     2453    2453           
======================================
  Hits        15376   15376           
  Misses       7595    7595           
  Partials      149     149

Impacted Files	Coverage Δ
superset/assets/src/explore/controls.jsx	42.18% <ø> (ø)	⬆️

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