feat: Add Czech Republic country map. (#28035)

superset-frontend/plugins/legacy-plugin-chart-country-map/scripts/Country Map GeoJSON Generator.ipynb

@@ -238,6 +238,7 @@
     "  'costa rica',\n",
     "  'cuba',\n",
     "  'cyprus',\n",
+    "  'czech republic'\n",
     "  'denmark',\n",
     "  'dominican republic',\n",
     "  'ecuador',\n",

superset-frontend/plugins/legacy-plugin-chart-country-map/src/countries.ts

@@ -35,6 +35,7 @@ import colombia from './countries/colombia.geojson';
 import costa_rica from './countries/costa_rica.geojson';
 import cuba from './countries/cuba.geojson';
 import cyprus from './countries/cyprus.geojson';
+import czech_republic from './countries/czech_republic.geojson';
 import denmark from './countries/denmark.geojson';
 import dominican_republic from './countries/dominican_republic.geojson';
 import ecuador from './countries/ecuador.geojson';
@@ -134,6 +135,7 @@ export const countries = {
   costa_rica,
   cuba,
   cyprus,
+  czech_republic,
   denmark,
   dominican_republic,
   ecuador,