feat: Use functional API of @googlemaps/js-api-loader #113

Job	Run time
setup / setup (ubuntu-22.04)	22s
setup / setup (macos-15)	54s
verify-packages / verify-ios (/Applications/Xcode_16.4.app)	1m 21s
verify-packages / verify-android	2m 40s
lint-test / lint	49s
verify-packages / verify-web	37s
	6m 43s

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