[FIX] - Multi signature offchain flow

[astaphobia]

Description

In this PR include enhancement on multi signature transaction stuff, allowing post a multi signature transaction in offchain flow.

In OffChain case if one of SignatureInfo.Signatures is a multisignature address and the Key format would be like:

MultiSignature Key

• [4] AccountType
• [4] MultiSignatureInfoLength
• [N] MultiSignatureInfo pure in bytes format.

If One of MultiSignature Key participant is a MultiSignatureAddress again, it should repeat the MultiSignature Key format again.

And otherwise Key should account address bytes format.

MultiSignature Value

• [N] Signature

OffChain flow can contains 3 nested MultiSignature Key

if len(*multiSignaturesInfo) == int(constant.MaxAllowedMultiSignatureTransactions) {
	return fmt.Errorf("MaxAllowedNestedMultiSignatureOffChainExceeded")
}

method ParseSignatureInfoBytesAsCandidates will called in recursively to parsing Key of SignatureInfo.Signatures`

Breakdown

• ParseMultiSignatureInfoBytes , it use to parse bytes from one of signature info as MultiSignatureInfo
• ParseSignatureInfoBytesAsCandidates, it use to parse bytes from SignatureInfo.Signatures and the result is []model.PendingSignature and [].model.MultiSignatureInfo
• ParseBodyBytes for offchain flow
• GetBodyBytes for offchain flow
• CMD multisignatureinfo transaction in offchain flow
• Check multi signature completed or not

Reference Issue

Close #1337
Refer also on: zoobc/zoobc-schema#173