[Windows] readDir() and probably other methods don't handle special characters in directory paths

[AchillesChristianPrinz]

The readDir method in ReactNativeModule.cpp does not correctly handle directory paths that contain special characters such as ö, ä, ü. This causes the method to fail when attempting to read directories with such characters in their paths.

react-native-fs/windows/ReactNativeFs/ReactNativeModule.cpp

Line 491 in 5df8019

winrt::fire_and_forget ReactNativeModule::readDir(std::string directory, ReactPromise<JSValueArray> promise) noexcept

Suggested fix

Ensure that the methods correctly handle special characters by using std::wstring for directory paths and making necessary adjustments to the method calls.