generateProviderExtMethods method
Implementation
void generateProviderExtMethods(StringBuffer strBuffer, String className) {
strBuffer.writeln('''
extension ${className}ProviderExtensionMethodsOnBuildContext on BuildContext {
$className read$className() => read<$className>();
$className watch$className() => watch<$className>();
R select$className<R>(R Function($className s) selector) => select(selector);
}
''');
strBuffer.writeln();
}