Migrate package usages from amap_flutter_base to amap_flutter_base_clx across example and library code. Remove unused imports, tidy formatting (add trailing commas, reformat multi-line calls/constructors), and simplify several method channel invocations for readability. Add new third_party/amap_flutter_base/lib/amap_flutter_base_clx.dart with the library parts and replace the original amap_flutter_base.dart with a stub TODO. Update exports and type imports to reference the new clx variant.

Remove the legacy registerWith(PluginRegistry.Registrar) implementation and PluginRegistry import from AMapFlutterMapPlugin to rely on the newer Flutter embedding lifecycle. In ConvertUtil, replace deprecated FlutterMain.getLookupKeyForAsset calls with FlutterInjector.instance().flutterLoader().getLookupKeyForAsset and update imports accordingly (affects both fromAsset and fromAssetImage paths). These changes migrate the plugin to the newer Flutter loader/embedding APIs.

2、增加检测是否在覆盖区域判断方法