feat: add Snow and Rain particle effect components (#4179)

* feat: add Snow and Rain particle effect components

Implements <Snow /> and <Rain /> components backed by Mapbox Maps SDK
v11.9+ experimental precipitation APIs (@_spi(Experimental)).

- Add snow/rain to the code generator (generateCodeWithEjs.mjs, globals.mjs)
- Generate SnowLayerStyleProps / RainLayerStyleProps TypeScript types
- Add RNMBXSnow / RNMBXRain iOS singleton layer implementations
- Add RNMBXSnow / RNMBXRain Fabric component views (iOS)
- Add RNMBXSnow / RNMBXRain Android implementations + managers
- Register components in RNMBXPackage and package.json codegenConfig
- Export Snow and Rain from src/Mapbox.native.ts
- Add SnowAndRain example (V11) and integrate into TerrainSkyAtmosphere
- Bump Mapbox SDK iOS + Android to 11.20.1
- Work around MapContentReconciler reset of rain by async re-applying
  after initial style load completes

* fix: set explicit Rain color/vignetteColor to avoid measure-light expression errors

The default color and vignetteColor for Rain use measure-light(brightness)
expressions which fail with 'Brightness is unavailable in the current
evaluation context' in terrain/atmosphere map styles. Set explicit static
colors to bypass the failing expressions.

* docs: note measure-light limitation in Rain component JSDoc

* fix: use Standard style in TerrainSkyAtmosphere so Rain measure-light works natively

* fix: deduplicate shared property names in styleMap.ts, add precommit script

* fix: add Snow and Rain to public interface test

* chore: regenerate generated files (new style spec properties)

* fix: correct Snow/Rain import paths and remove unsupported rasterElevationReference

Fix Android build by using precipitations.generated package path for
Snow/Rain. Remove rasterElevationReference (not in SDK 11.20.1 despite
spec claiming 11.19.0). Add measure-light availability warning to Rain.

* fix: use getStyleLights() method instead of styleLights property

Author: mfazekas

__tests__/interface.test.js

@@ -44,6 +44,8 @@ describe('Public Interface', () => {
       'SkyLayer',
       'Terrain',
       'Atmosphere',
+      'Snow',
+      'Rain',
 
       // sources
       'VectorSource',

android/src/main/java/com/rnmapbox/rnmbx/RNMBXPackage.kt

@@ -26,6 +26,8 @@ import com.rnmapbox.rnmbx.components.mapview.NativeMapViewModule
 import com.rnmapbox.rnmbx.components.mapview.RNMBXMapViewManager
 import com.rnmapbox.rnmbx.components.styles.RNMBXStyleImportManager
 import com.rnmapbox.rnmbx.components.styles.atmosphere.RNMBXAtmosphereManager
+import com.rnmapbox.rnmbx.components.styles.snow.RNMBXSnowManager
+import com.rnmapbox.rnmbx.components.styles.rain.RNMBXRainManager
 import com.rnmapbox.rnmbx.components.styles.layers.RNMBXBackgroundLayerManager
 import com.rnmapbox.rnmbx.components.styles.layers.RNMBXCircleLayerManager
 import com.rnmapbox.rnmbx.components.styles.layers.RNMBXFillExtrusionLayerManager
@@ -169,6 +171,8 @@ class RNMBXPackage : TurboReactPackage() {
         managers.add(RNMBXSkyLayerManager())
         managers.add(RNMBXTerrainManager())
         managers.add(RNMBXAtmosphereManager())
+        managers.add(RNMBXSnowManager())
+        managers.add(RNMBXRainManager())
         managers.add(RNMBXBackgroundLayerManager())
         managers.add(RNMBXLightManager())
         managers.add(RNMBXModelLayerManager())