wire: message `MsgVote` for voting and announcing unique blocks

[SebastianElvis]

Problem

To finalise a block, ORazor requires nodes to certify the block and announce the uniqueness of the block. To this end, we need a new type of message MsgVote. It contains three fields:

• Address: the voter's address
• VotedBlockHash: the hash of the block being voted
• Type: whether the vote is to certify a block or annonce the block uniqueness

Description

Alternatives

Additional context

[jianyu-niu]

We can simplify it into one by including one bit to denote the types of votes. (As for realization, we can reuse codes of generating transactions interface. Need discussion)

[SebastianElvis]

We can simplify it into one by including one bit to denote the types of votes. (As for realization, we can reuse codes of generating transactions interface. Need discussion)

Agree

[SebastianElvis]

Things to note when implementing a new message type:

• All message types are listed at https://github.com/SebastianElvis/orazor/blob/main/wire/message.go#L30-L61
• The message has to implement the Message interface in https://github.com/SebastianElvis/orazor/blob/main/wire/message.go#L81-L90
• Function makeEmptyMessage needs to include the message type https://github.com/SebastianElvis/orazor/blob/main/wire/message.go#L92-L191