refactor: update compile and target SDK versions

- Update compile SDK version to use project property if available, fallback to default
- Update target SDK version to use project property if available, fallback to default

Author: muzahidul-opti

android/build.gradle

@@ -25,14 +25,14 @@ rootProject.allprojects {
 
 ext {
     compile_sdk_version = 35
-    build_tools_version = "35.0.0"
     min_sdk_version = 21
 }
 
 android {
     namespace 'com.optimizely.optimizely_flutter_sdk'
-    compileSdkVersion compile_sdk_version
-    buildToolsVersion build_tools_version
+    compileSdkVersion rootProject.hasProperty('flutter.compileSdkVersion') 
+                        ? rootProject.flutter.compileSdkVersion.toInteger() 
+                        : compile_sdk_version
 
     buildFeatures {
         buildConfig true

example/android/app/build.gradle

@@ -25,7 +25,10 @@ if (flutterVersionName == null) {
 
 android {
     namespace "com.optimizely.optimizely_flutter_sdk_example"
-    compileSdkVersion 35
+
+    compileSdkVersion rootProject.hasProperty('flutter.compileSdkVersion') 
+                        ? rootProject.flutter.compileSdkVersion.toInteger() 
+                        : 35
 
     compileOptions {
         sourceCompatibility JavaVersion.VERSION_1_8
@@ -38,7 +41,10 @@ android {
         // You can update the following values to match your application needs. 
         // For more information, see: https://docs.flutter.dev/deployment/android#reviewing-the-build-configuration.
         minSdkVersion flutter.minSdkVersion
-        targetSdkVersion 35   
+        targetSdkVersion rootProject.hasProperty('flutter.targetSdkVersion') 
+                        ? rootProject.flutter.targetSdkVersion.toInteger() 
+                        : 35
+
         versionCode flutterVersionCode.toInteger()
         versionName flutterVersionName
     }