Add 3d samples

[oppenheimera]

First round of updates

[snippet-bot]

Here is the summary of changes.

You are about to add 12 region tags.

• samples/3d-marker-customization/index.ts:16, tag maps_3d_marker_customization
• samples/3d-marker-customization/style.css:14, tag maps_3d_marker_customization
• samples/3d-places/index.ts:15, tag maps_3d_places
• samples/3d-places/style.css:14, tag maps_3d_places
• samples/3d-popover-location/index.ts:16, tag maps_3d_popover_location
• samples/3d-popover-location/style.css:14, tag maps_3d_popover_location
• samples/3d-popover-marker/index.ts:16, tag maps_3d_popover_marker
• samples/3d-popover-marker/style.css:14, tag maps_3d_popover_marker
• samples/3d-simple-map/index.ts:16, tag maps_3d_simple_map
• samples/3d-simple-map/style.css:14, tag maps_3d_simple_map
• samples/3d-simple-marker/index.ts:15, tag maps_3d_simple_marker
• samples/3d-simple-marker/style.css:14, tag maps_3d_simple_marker

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