chore: replace the GMS folder with main

[kikoso]

This PR moves all the content from the GMS folder into main, using gh mv. It also updates our build scripts and docs.

[snippet-bot]

Here is the summary of changes.

You are about to add 20 region tags.

• ApiDemos/java/app/src/main/java/com/example/mapdemo/AdvancedMarkersDemoActivity.java:38, tag maps_android_sample_marker_advanced
• ApiDemos/java/app/src/main/java/com/example/mapdemo/BasicMapDemoActivity.java:30, tag maps_android_sample_basic_map
• ApiDemos/java/app/src/main/java/com/example/mapdemo/CameraDemoActivity.java:45, tag maps_camera_events
• ApiDemos/java/app/src/main/java/com/example/mapdemo/EventsDemoActivity.java:34, tag maps_android_sample_events
• ApiDemos/java/app/src/main/java/com/example/mapdemo/MarkerDemoActivity.java:67, tag maps_android_sample_marker
• ApiDemos/java/app/src/main/java/com/example/mapdemo/MyLocationDemoActivity.java:44, tag maps_android_sample_my_location
• ApiDemos/java/app/src/main/java/com/example/mapdemo/MyLocationDemoActivity.java:90, tag maps_check_location_permission
• ApiDemos/java/app/src/main/java/com/example/mapdemo/MyLocationDemoActivity.java:118, tag maps_check_location_permission_result
• ApiDemos/java/app/src/main/java/com/example/mapdemo/PolygonDemoActivity.java:50, tag maps_android_sample_polygons
• ApiDemos/java/app/src/main/java/com/example/mapdemo/PolylineDemoActivity.java:57, tag maps_android_sample_polylines
• ApiDemos/kotlin/app/src/main/java/com/example/kotlindemos/AdvancedMarkersDemoActivity.kt:49, tag maps_android_sample_marker_advanced
• ApiDemos/kotlin/app/src/main/java/com/example/kotlindemos/BasicMapDemoActivity.kt:31, tag maps_android_sample_basic_map
• ApiDemos/kotlin/app/src/main/java/com/example/kotlindemos/CameraDemoActivity.kt:44, tag maps_camera_events
• ApiDemos/kotlin/app/src/main/java/com/example/kotlindemos/EventsDemoActivity.kt:28, tag maps_android_sample_events
• ApiDemos/kotlin/app/src/main/java/com/example/kotlindemos/MarkerDemoActivity.kt:64, tag maps_android_sample_marker
• ApiDemos/kotlin/app/src/main/java/com/example/kotlindemos/MyLocationDemoActivity.kt:40, tag maps_android_sample_my_location
• ApiDemos/kotlin/app/src/main/java/com/example/kotlindemos/MyLocationDemoActivity.kt:72, tag maps_check_location_permission
• ApiDemos/kotlin/app/src/main/java/com/example/kotlindemos/MyLocationDemoActivity.kt:126, tag maps_check_location_permission_result
• ApiDemos/kotlin/app/src/main/java/com/example/kotlindemos/PolygonDemoActivity.kt:85, tag maps_android_sample_polygons
• ApiDemos/kotlin/app/src/main/java/com/example/kotlindemos/PolylineDemoActivity.kt:111, tag maps_android_sample_polylines

You are about to delete 20 region tags.

• ApiDemos/java/app/src/gms/java/com/example/mapdemo/AdvancedMarkersDemoActivity.java:38, tag maps_android_sample_marker_advanced
• ApiDemos/java/app/src/gms/java/com/example/mapdemo/BasicMapDemoActivity.java:30, tag maps_android_sample_basic_map
• ApiDemos/java/app/src/gms/java/com/example/mapdemo/CameraDemoActivity.java:45, tag maps_camera_events
• ApiDemos/java/app/src/gms/java/com/example/mapdemo/EventsDemoActivity.java:34, tag maps_android_sample_events
• ApiDemos/java/app/src/gms/java/com/example/mapdemo/MarkerDemoActivity.java:67, tag maps_android_sample_marker
• ApiDemos/java/app/src/gms/java/com/example/mapdemo/MyLocationDemoActivity.java:44, tag maps_android_sample_my_location
• ApiDemos/java/app/src/gms/java/com/example/mapdemo/MyLocationDemoActivity.java:90, tag maps_check_location_permission
• ApiDemos/java/app/src/gms/java/com/example/mapdemo/MyLocationDemoActivity.java:118, tag maps_check_location_permission_result
• ApiDemos/java/app/src/gms/java/com/example/mapdemo/PolygonDemoActivity.java:50, tag maps_android_sample_polygons
• ApiDemos/java/app/src/gms/java/com/example/mapdemo/PolylineDemoActivity.java:57, tag maps_android_sample_polylines
• ApiDemos/kotlin/app/src/gms/java/com/example/kotlindemos/AdvancedMarkersDemoActivity.kt:49, tag maps_android_sample_marker_advanced
• ApiDemos/kotlin/app/src/gms/java/com/example/kotlindemos/BasicMapDemoActivity.kt:31, tag maps_android_sample_basic_map
• ApiDemos/kotlin/app/src/gms/java/com/example/kotlindemos/CameraDemoActivity.kt:44, tag maps_camera_events
• ApiDemos/kotlin/app/src/gms/java/com/example/kotlindemos/EventsDemoActivity.kt:28, tag maps_android_sample_events
• ApiDemos/kotlin/app/src/gms/java/com/example/kotlindemos/MarkerDemoActivity.kt:64, tag maps_android_sample_marker
• ApiDemos/kotlin/app/src/gms/java/com/example/kotlindemos/MyLocationDemoActivity.kt:40, tag maps_android_sample_my_location
• ApiDemos/kotlin/app/src/gms/java/com/example/kotlindemos/MyLocationDemoActivity.kt:72, tag maps_check_location_permission
• ApiDemos/kotlin/app/src/gms/java/com/example/kotlindemos/MyLocationDemoActivity.kt:126, tag maps_check_location_permission_result
• ApiDemos/kotlin/app/src/gms/java/com/example/kotlindemos/PolygonDemoActivity.kt:85, tag maps_android_sample_polygons
• ApiDemos/kotlin/app/src/gms/java/com/example/kotlindemos/PolylineDemoActivity.kt:111, tag maps_android_sample_polylines

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