feat: Migrates the web-components-map sample.

[willum070]

This change does the following things:

• Migrates the web-components-map sample.
• Refactors to use the new bootstrap loader.

[snippet-bot]

Here is the summary of changes.

You are about to add 4 region tags.

• samples/web-components-map/index.html:7, tag maps_web_components_map
• samples/web-components-map/index.html:19, tag maps_web_components_map_gmpmap
• samples/web-components-map/index.ts:7, tag maps_web_components_map
• samples/web-components-map/style.css:6, tag maps_web_components_map

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