feat: Refactors advanced-markers-graphics to use gmp-map.

[willum070]

This PR makes the following changes:

• Updates the sample to use the gmp-map element.
• Refactors marker code to append rather than declare the map element.

[snippet-bot]

Here is the summary of changes.

You are about to add 4 region tags.

• samples/advanced-markers-graphics/index.ts:23, tag maps_advanced_markers_graphics_inline
• samples/advanced-markers-graphics/index.ts:45, tag maps_advanced_markers_graphics_png
• samples/advanced-markers-graphics/index.ts:61, tag maps_advanced_markers_graphics_svg_glyph
• samples/advanced-markers-graphics/index.ts:78, tag maps_advanced_markers_graphics_place_icon

You are about to delete 4 region tags.

• samples/advanced-markers-graphics/index.ts:20, tag maps_advanced_markers_graphics_inline
• samples/advanced-markers-graphics/index.ts:39, tag maps_advanced_markers_graphics_png
• samples/advanced-markers-graphics/index.ts:55, tag maps_advanced_markers_graphics_svg_glyph
• samples/advanced-markers-graphics/index.ts:72, tag maps_advanced_markers_graphics_place_icon

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