Unity 6 and Android Gradle Plugin 8+ support for Unity SDK

[nhannguyentrong2gl]

Unity 6 has migrated to AGP 8.3.0 which is no longer compatible with sa-sdk-unity package 2.0.2 with SDK v6.6.6

SDK v6.6.6 has the dependency to sa-sdk-android-plugin2 v3.5.4 which is not yet supported by AGP 8+

Seems like it needs to be updated to at least v6.6.9+ with deps sa-sdk-android-plugin2 v4.0.0+ to support AGP 8+ as mention in https://docs.sensorsdata.com/sa/docs/tech_sdk_client_android_basic/v0300

Thanks!