feat(legacy-plugin-chart-country-map): Add Laos

[ukanga]

🏆 Enhancements

Add Laos country map

[vercel]

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[villebro]

The codebase on this repo has been moved to the main Apache Superset repo, and consequently the repo is in the process of being archived. See the Superset Improvement Proposal for details: apache/superset#13013 . While all currently open issues and PRs will be closed, we encourage you to reopen this PR on the main repo, which should be as simple as moving over any code changes as follows:

• core packages: packages/** (this repo) -> superset-frontend/packages/** (main repo)
• plugins: plugins/** (this repo) -> superset-frontend/plugins/** (main repo)

If you need help with the migration, please post a message on the SIP or reach out on the community Slack.