Implement standard device key format #27
Description
We are going to standardize the DeviceContext/DeviceKeys JSON format across all SDKs. The proposed format (in Typescript) is:
{
deviceId: number;
accountId: string;
segmentId: number;
devicePrivateKey: Base64String;
// “expanded private key” (both pub/priv)
signingPrivateKey: Base64String;
}