keyJson has incorrect datastructure

[bootstrapsp]

Describe the bug
CreateKey method in DID request message DidCreateKeyRequest{
int64 WalletHandle = 1;
string KeyJson = 2;

KeyJson should be a complex dataType with Seed and Crypto as string

To Reproduce
NA

Expected behavior
Proto should have definition :

message DidCreateKeyRequest{
  int64 WalletHandle = 1;
  KeyJson KeyJson = 2;
}

message KeyJson{
string seed = 1;
string crypto = 2;
}

Additional context
There are more than one usage of KeyJson , i.e. there are multiple services like from Crypto, DID that uses KeyJson message. Therefore, individual messages should be created rather than re-using them between services.

This will require proto change as well as update on server and client side.