Add more Surface bindings

[mzgreen]

Added more bindings for Surface:

int getWidth()
int getHeight()
ImageInfo getImageInfo()
int generationId()
void notifyContentWillChange(ContentChangeMode)
DirectContext getRecordingContext()
Surface makeSurfaceI(ImageInfo);
Surface makeSurface(int, int);
Image makeImageSnapshotR(IRect);
void draw(Canvas, float, float, Paint);
boolean readPixels(Bitmap, int, int);
void writePixels(Bitmap, int, int);
void flushAndSubmit(boolean);
void flush();
boolean isUnique();

[mzgreen]

Not sure how those ascii progress bars in readme are calculated so I haven't updated it 😅

[tonsky]

Awesome, thank you!