fix(android): let VideoScreenObject orientation be set from Dart

[samerzmd]

Problem

VideoScreenObject already supports imageOrientation, deviceOrientation
and rotatesWithContent in HaishinKit.kt, but none of them are reachable from
Dart: the Dart object serialises only track, and the native elements setter
reads only track (VideoScreenObject$Keys contains nothing else).

The consequence is that a capture keeps whatever rotation it had when the video
source was attached. A device held in landscape renders rotated by 90 degrees —
in the preview texture and in the published stream — and there is no way to
correct it from Dart. Re-attaching the video source does not help, and neither
does rotating the display.

Change

• Dart VideoScreenObject gains imageOrientation, deviceOrientation and
  rotatesWithContent, and serialises them into elements.
• ScreenHandler applies those elements to the native object.

Two files, no API removed, no behaviour change for callers that don't set the
new properties (deviceOrientation defaults to 0, rotatesWithContent to true).

Verification

Galaxy S22 Ultra held in landscape, printed text in frame as the reference
(furniture edges are ambiguous under a 90° rotation): the label reads
vertically before the change and horizontally after.

Note for maintainers

Consumers currently need an explicit VideoScreenObject(track: 0) for this to
apply, since track 0 renders through the Screen itself where there's no handle
to reach. If you'd prefer to plumb orientation at that level instead, that would
be the better fix and I'm happy to drop this.