build: add Spotless with ktlint formatting checks

[kikoso]

Adds Spotless with ktlint so formatting is checked automatically on pull requests, instead of in review comments.

The configuration matches the one already used in android-maps3d-samples, so all the Maps Android repos format Kotlin the same way.

Changes

• build: add Spotless with ktlint...: Spotless 8.9.0 in the version catalog, one root spotless {} block covering every .kt file, max_line_length = 120 in .editorconfig, a ./gradlew spotlessCheck step in the lint job of lint-report.yml, and a note in CONTRIBUTING.md to run ./gradlew spotlessApply before opening a PR.
• style: apply Spotless formatting: the output of ./gradlew spotlessApply, plus a few manual, behaviour-neutral fixes (wildcard imports replaced, a few long @Deprecated messages split with +).

Disabled ktlint rules, so this stays formatting-only: property-naming and filename (fixing them would mean renames). No public API is renamed in maps-compose, maps-compose-utils or maps-compose-widgets.

Merging

Please use rebase and merge so the reformat stays a separate commit. After merging, I will add its SHA to .git-blame-ignore-revs in a small follow-up, so git blame skips it.

Open PRs will likely need a rebase and a ./gradlew spotlessApply after this lands.

Verification

./gradlew spotlessCheck assembleDebug testDebugUnitTest assembleDebugAndroidTest pass locally.

[github-actions]

Coverage (unit tests)

Compared against 85a56aa on main (#1034).

Module	Line %	Change	Branch %	Change
maps-compose	0.00%	no change	0.00%	no change
maps-compose-utils	2.06%	🔺 +0.02	0.49%	no change
maps-compose-widgets	0.00%	no change	0.00%	no change
TOTAL	0.42%	🔺 +0.01	0.09%	no change

_{Line and branch coverage from unit test reports. History is recorded on the coverage-history branch after each merge to main.}

[googlemaps-bot]

Coverage (instrumentation tests)

Overall Project	44.43% -7.68%	🍏
Files changed	35.85%	❌

Module	Coverage
maps-app	73.12% -1.35%	🍏
maps-app	63.22% -4.65%	🍏
maps-app	55.95% -3.4%	❌
debug	24.69% -11.53%	❌

Files

Module	File	Coverage
maps-app	ScaleBar.kt	73.12% -1.35%	🍏
maps-app	MapType.kt	100%	🍏
	AttributionIdInitializer.kt	100%	🍏
	RememberComposeBitmapDescriptor.kt	96.08%	🍏
	CameraMoveStartedReason.kt	96%	🍏
	ComposeInfoWindowAdapter.kt	90.84%	🍏
	MapClickListeners.kt	89.76% -6.79%	🍏
	StreetView.kt	88.76% -1.83%	🍏
	StreetViewPanoramaApplier.kt	88.24%	🍏
	MapUpdater.kt	80.28% -2.29%	🍏
	GoogleMap.kt	79.52% -12.18%	🍏
	Polyline.kt	74.44% -1.12%	🍏
	Circle.kt	73.66% -2.23%	❌
	StreetViewPanoramaUpdater.kt	72.55%	🍏
	Polygon.kt	70.87% -2.23%	🍏
	MapComposeViewRender.kt	67.64%	🍏
	CameraPositionState.kt	66.84% -5.97%	❌
	Marker.kt	64.38% -4.7%	❌
	StreetViewPanoramaEventListeners.kt	61.19%	🍏
	MapProperties.kt	55.96% -1.11%	❌
	MapUiSettings.kt	54.52% -2.07%	❌
	InputHandler.kt	43.98%	🍏
	StreetViewCameraPositionState.kt	39.58% -13.02%	🍏
	MapApplier.kt	31.13% -4.69%	❌
	MapEffect.kt	20.82% -1.17%	❌
	TileOverlay.kt	0% -6.17%	❌
	GroundOverlay.kt	0% -8.29%	❌
maps-app	ClusterRenderer.kt	71.64% -1.71%	🍏
	Clustering.kt	53.46% -3.46%	❌
	WmsUrlTileProvider.kt	0%	🍏
	WmsTileOverlay.kt	0% -18.95%	❌
debug	BasicMapActivity.kt	79.71% -2.12%	🍏
	RecompositionActivity.kt	75.58% -1.32%	🍏
	MapInColumnActivity.kt	69.68% -3.32%	🍏
	MapsInLazyColumnActivity.kt	64.83% -0.41%	🍏
	MarkerClusteringActivity.kt	1.8% -8.86%	❌
	UpdatingNoDragMarkerWithDataModelActivity.kt	0% -23.96%	❌
	MapFragmentPagerAdapter.kt	0% -19.64%	❌
	GroundOverlayActivity.kt	0% -14.21%	❌
	WmsTileOverlayActivity.kt	0% -60.37%	❌
	AccessibilityActivity.kt	0% -3.7%	❌
	LocationTrackingActivity.kt	0% -16.69%	❌
	ScaleBarActivity.kt	0% -15.88%	❌
	CustomControlsActivity.kt	0% -9%	❌
	LiteModeActivity.kt	0% -21.98%	❌
	TileOverlayActivity.kt	0%	🍏
	StreetViewActivity.kt	0% -1.68%	❌
	FragmentDemoActivity.kt	0%	🍏
	MainActivity.kt	0% -27.7%	❌
	GoogleMapComposeFragment.kt	0% -40.23%	❌
	Demo.kt	0% -18.63%	❌
	SyncingDraggableMarkerWithDataModelActivity.kt	0% -10.14%	❌
	MarkerDragEventsActivity.kt	0% -25.26%	❌
	Theme.kt	0% -28.57%	❌
	MarkerClusteringRotationActivity.kt	0% -10.41%	❌
	AdvancedMarkersActivity.kt	0% -4.39%	❌
	DraggableMarkersCollectionWithPolygonActivity.kt	0% -15.4%	❌
	MarkersCollectionActivity.kt	0% -32.18%	❌