feat: Filesystem copy method - read the full filepath in the "from" property

[dotNetkow]

Feature Request

Related to ionic-team/capacitor#3940, but thought it worth splitting into two issues.

Description

The Filesystem plugin could read the full filepath in the from property - no directory prop needed.

My use case is moving a photo taken with the official Camera plugin (stored in temp storage, "cache" folder) to permanent storage (data directory).

Here's an example:

// photoFilename = file:///data/user/0/io.ionic.pg.ng.cap/cache/JPEG_20201211_140602.jpg
const savedFile = await Filesystem.copy({
   from: photoFilename,  
   directory: FilesystemDirectory.Cache,  // remove this
    to: "newPhoto.jpg",
    toDirectory: FilesystemDirectory.Data
});

Platform(s)

web, ios, android

Preferred Solution

const savedFile = await Filesystem.copy({
   from: photoFilename,  // directory prop removed, Capacitor parses filename for us
    to: "newPhoto.jpg",
    toDirectory: FilesystemDirectory.Data
});

[jcesarmobile]

This should also be possible no as #250 was merged

I've added a few buttons to the sample app to verify and they seem to work fine
ionic-team/capacitor-testapp#129

[ionitron-bot]

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