[react-native] Add "rotation" property to TensorCamera to allow users to rotate camera view and internal texture

[jinjingforever]

This is needed to support orientation change on iOS. The idea is to add a rotation property to TensorCamera. Once it is set, TensorCamera will rotate the internal texture and the preview image for the given degrees. Thanks @nicholasio for the original fix.

For Android, users can ignore this property because Android will automatically rotate the camera texture within the system.

Will send another PR in tfjs-examples that demonstrates how this is used.

Fixes #3041 #2987

To see the logs from the Cloud Build CI, please join either our discussion or announcement mailing list.

---

This change is 

[pyu10055]

thanks, couple small comments, feel free to merge after addressing those.

Reviewable status: complete! 1 of 1 approvals obtained (waiting on @jinjingforever)

---

tfjs-react-native/src/camera/camera.ts, line 197 at r1 (raw file):

  tf.util.assert(
      [0, 90, 180, 270, 360, -90, -180, -270].includes(rotation),

0 and 360 would not have any effect on the texture of the camera?

---

tfjs-react-native/src/camera/camera_stream.tsx, line 105 at r1 (raw file):

 *   control on when rendering happens.
 * - __rotation__: number — the degrees that the internal camera texture and
 *   preview will be rotated.

add the allowed value list to the doc?

[jinjingforever]

Reviewable status: complete! 1 of 1 approvals obtained (waiting on @pyu10055)

---

tfjs-react-native/src/camera/camera.ts, line 197 at r1 (raw file):

Previously, pyu10055 (Ping Yu) wrote…

0 and 360 would not have any effect on the texture of the camera?

Correct. The rotation done in the shader would be a no-op.

---

tfjs-react-native/src/camera/camera_stream.tsx, line 105 at r1 (raw file):

Previously, pyu10055 (Ping Yu) wrote…

add the allowed value list to the doc?

Done.