setAngle(angle, isSilent) {
    return this._rotate('setAngle', angle, isSilent);
  }
Set angle
@param {number} angle - Angle of image
@param {boolean} isSilent - is silent execution or not
@returns {Promise<RotateStatus, ErrorMsg>}
@example
imageEditor.setAngle(10); // angle = 10
imageEditor.rotate(10); // angle = 20
imageEditor.setAngle(5); // angle = 5
imageEditor.rotate(50); // angle = 55
imageEditor.setAngle(-40); // angle = -40
imageEditor.setAngle(10).then(status => {
    console.log('angle: ', status.angle);
})).catch(message => {
    console.log('error: ', message);
});