feat: Adds a very simple 3D map.

[willum070]

No description provided.

[snippet-bot]

Here is the summary of changes.

You are about to add 3 region tags.

• samples/maps-3d-simple/index.html:7, tag maps_map_3d_simple
• samples/maps-3d-simple/index.ts:7, tag maps_map_3d_simple
• samples/maps-3d-simple/style.css:6, tag maps_map_3d_simple

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