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
}

``

The issue provides Go definitions for SignedMessage, Message, and Signature but names no Java files or tests. Start by locating the Java IPLD CBOR encoding API and compare its supported types with the supplied structure; done should be a clear Java encoding approach or example for this data.

索引モデルが issue の本文から書いたものです。