🐛 Fix compatibility with AGP 8.0

[LeGoffMael]

fix #38

• Apply Flutter Gradle's plugin implementation doc
• Fix compatibility with AGP 8.0 #38, flutter/flutter#125621
  • Upgrade assets_picker_crop to 0.0.3
  • Upgrade example to gradle 8.2.2 + java 17 + kotlin 1.9.20
  • Upgrade example transitive dependencies
• Update example android/ios conf files

Gradle script to detect dependencies without namespace :

subprojects {
     afterEvaluate { project ->
         if (project.hasProperty('android')) {
             project.android {
                 if (namespace == null) {
                     print("Setting ${project.group} as no android namespace")
                     namespace project.group
                 }
             }
         }
    }
}