feat(chart): Added Papua New Guinea to countries map

[wilfred-wulbou]

SUMMARY

Added Papua New Guinea to countries map chart.

BEFORE/AFTER SCREENSHOTS OR ANIMATED GIF

TESTING INSTRUCTIONS

Clone this fork. Open a terminal and cd to root directory, then execute the following:

cd superset-frontend && npm install
npm run plugins:storybook

ADDITIONAL INFORMATION

• Has associated issue:
• Required feature flags:
• Changes UI
• Includes DB Migration (follow approval process in SIP-59)
  • Migration is atomic, supports rollback & is backwards-compatible
  • Confirm DB migration upgrade and downgrade tested
  • Runtime estimates and downtime expectations provided
• Introduces new feature or API
• Removes existing feature or API

[github-actions]

Congrats on making your first PR and thank you for contributing to Superset! 🎉 ❤️
We hope to see you in our Slack community too!

[villebro]

LGTM, thanks for adding this!

[codecov]

Codecov Report

Merging #22589 (544c0eb) into master (40dba06) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master   #22589   +/-   ##
=======================================
  Coverage   67.00%   67.00%           
=======================================
  Files        1859     1859           
  Lines       71019    71019           
  Branches     7766     7766           
=======================================
  Hits        47587    47587           
  Misses      21410    21410           
  Partials     2022     2022           

Flag	Coverage Δ
javascript	53.85% <ø> (ø)

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

Impacted Files	Coverage Δ
...s/legacy-plugin-chart-country-map/src/countries.ts	100.00% <ø> (ø)

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