Add japan building data sandcastle

[jjspace]

Description

• create a sandcastle to highlight our new Japan building dataset
• Includes a few POIs in different locations to showcase the data
  • I planned to add translations for the dropdown, those should come shortly.
• I opted for a light that comes from the camera to avoid nighttime making the buildings darker
• I turned on antialiasing as it helps a lot with the edges of buildings especially in the areas that have actual imagery textures. @ggetz is there anything else that might make sense as "easy wins" to increase the visual quality?

Issue number and link

No issue

Testing plan

• Run npm start
• open sandcastle and navigate to the Japan Buildings one
• Test the sandcastle and make sure it behaves well
• Make sure it shows up in search and the categories make sense
• Make sure the thumbnail looks good

Author checklist

• I have submitted a Contributor License Agreement
• I have added my name to CONTRIBUTORS.md
• I have updated CHANGES.md with a short summary of my change
• I have added or updated unit tests to ensure consistent code coverage
• I have update the inline documentation, and included code examples where relevant
• I have performed a self-review of my code

[github-actions]

Thank you for the pull request, @jjspace!

✅ We can confirm we have a CLA on file for you.

[ggetz]

I turned on antialiasing as it helps a lot with the edges of buildings especially in the areas that have actual imagery textures. @ggetz is there anything else that might make sense as "easy wins" to increase the visual quality?

👍 That should be good for now. Other options like increasing the resolution could have performance implications, so let's hold off.

[jjhembd]

Looks good to me, thanks @jjspace !