Fix ConcurrentModificationException in addMarker method

Author: Duy Phạm

lib-compose/src/main/java/com/what3words/components/compose/maps/extensions/MapStateExtensions.kt

@@ -3,13 +3,14 @@ package com.what3words.components.compose.maps.extensions
 import com.what3words.components.compose.maps.models.W3WMarker
 import com.what3words.core.types.common.W3WError
 import com.what3words.core.types.common.W3WResult
+import java.util.Collections
 
 internal fun MutableMap<String, MutableList<W3WMarker>>.addMarker(
     listName: String,
     marker: W3WMarker,
 ): W3WResult<W3WMarker> {
     // Get or create the current list of markers (using MutableList for in-place updates)
-    val currentList = this.getOrPut(listName) { mutableListOf() }
+    val currentList = this.getOrPut(listName) { Collections.synchronizedList(mutableListOf()) }
 
     // Check if a marker with the same ID already exists
     val index = currentList.indexOfFirst { it.square.id == marker.square.id }