filecoin SignedMessage how to use java MarshalCBOR

filecoin SignedMessage how to use java MarshalCBOR .

The following is the source code of go language, how to use Java language to encode it

```

type SignedMessage struct {
Message Message
Signature crypto.Signature
}

type Message struct {
Version uint64

To address.Address
From address.Address

Nonce uint64

Value abi.TokenAmount

GasLimit int64
GasFeeCap abi.TokenAmount
GasPremium abi.TokenAmount

Method abi.MethodNum
Params []byte
}

type Signature struct {
Type SigType
Data []byte
}

``