feat(android): return and store exif data in blob/file

[m1ga]

Two new features:

• get exif data in event.media.exif from the camera media file
• it will also be store into a file when you run imageAsCompressed and write that blob data

var win = Ti.UI.createWindow();

win.addEventListener("click", function() {
    Ti.Media.showCamera({
        success: function(event) {
            console.log(event.media.exif)

            var f = Titanium.Filesystem.getFile(Titanium.Filesystem.applicationDataDirectory + "/image.jpg");
            f.write(event.media);

            var f1 = Titanium.Filesystem.getFile(Titanium.Filesystem.applicationDataDirectory + "/image1.jpg");
            f1.write(event.media.imageAsCompressed(0.9));
        }
    });
})

win.open();

Test 12.3.1:

• run the above code in Ti 12.3.1 and download the two files from your phone
• image1.jpg won't have any exif data

With this PR:

• image1.jpg will have exif data
• you will see a console.log with the exif data from the camera image

TODO

• docs
• test it a bit more and check other imageAs... methods