fix: use correct type for stat size

[manuelbieh]

Hey. I console.log'd a list of files I got from fs.readDir() and to me it looks like the size property is of type number, not string:

{
    "ctime": "2021-10-19T16:02:30.807Z",
    "mtime": "2021-10-19T16:02:35.146Z",
    "name": "B1979F99-6369-4036-8476-B6D14E653B0E.mp4",
    "path": "/private/var/mobile/Containers/Data/Application/0CE5748F-79A8-4120-B366-C92E6E0C6D17/tmp/ReactNative/B1979F99-6369-4036-8476-B6D14E653B0E.mp4",
    "size": 34234799,
}

Could you please check and verify/falsify that?

[Ceiridge]

size is still a string here:

react-native-fs/FS.common.js

Lines 46 to 54 in 5cc8afd

	size: string; // Size in bytes
	isFile: () => boolean; // Is the file just a file?
	isDirectory: () => boolean; // Is the file a directory?
	};
	type StatResult = {
	name: ?string; // The name of the item TODO: why is this not documented?
	path: string; // The absolute path to the item
	size: string; // Size in bytes

Is this intentional?
@itinance