Support of special characters in files names by `uploadFiles()`

[birdofpreyru]

Similar to #82, it looks like uploadFiles() does not support special characters (e.g. ö, ä, ü) in paths / file names; or at least on Android including special characters alters the upload results in an unexpected way.

[birdofpreyru]

Perhaps, can be closed, but lets wait for #91, to verify there is no apparent issues with this.

[birdofpreyru]

There is an issue with auto-detection of MIME-types for filenames with special characters (it is used to auto-set Content-Type for the uploaded file when no filetype option is provided explicitly for that file). The problem happens here:

react-native-fs/android/src/main/java/com/drpogodin/reactnativefs/Uploader.kt

Line 183 in 4e80566

val extension = MimeTypeMap.getFileExtensionFromUrl(path)

that MimeTypeMap.getFileExtensionFromUrl(path) (coming from Android library) returns empty string for filenames with special characters, e.g. /data/user/0/drpogodin.reactnativefs.example/cache/öäü-upload-file-2.txt, while it correctly returns txt for /data/user/0/drpogodin.reactnativefs.example/cache/upload-file-2.txt