Refactor blockchain_service methods

[fishseabowl]

Refactor some events and related methods of blockchain_service to remove redundancy and make more sense.

1. Remove PullBlocksFromPeer event, it was confused with HandlePullBlocks event

    PullBlocksFromPeer {
        peer_id: PeerId,
        sender: oneshot::Sender<Result<Ordinal, BlockchainError>>,
    },

2. Add QueryBlockOrdinalLocal event to check the last ordinal of the local blockchain

    QueryBlockOrdinalLocal {
        sender: oneshot::Sender<anyhow::Result<Ordinal>>,
    },

3. Rename PullBlocksLocal event to FetchBlocksLocal

4. Add a new field: peer_id to HandlePullBlocks event and change the type of the fieldsender to oneshot::Sender<anyhow::Result<Vec<Block>>>

    HandlePullBlocks { 
        start: Ordinal,
        end: Ordinal,
        peer_id: PeerId,
        sender: oneshot::Sender<anyhow::Result<Vec<Block>>>,
    },

5. Add a new field: peer_id to HandleQueryBlockOrdinal event

    HandleQueryBlockOrdinal {
        peer_id: PeerId,
        sender: oneshot::Sender<anyhow::Result<Ordinal>>,
    },

All of the above are currently under development and may change during implementation. Please feel free to add comments. thank you very much.