Add zero tracer

[cffls]

Zero tracer is a specific type of transaction tracer that records states read and written by a transaction.
The output of this tracer could be used together with block witness to generate intermediate block states in-between transactions.

Additional resources

Trace model class diagram

classDiagram
    class ContractCodeUsage {
        *Hash Read
        HexBytes Write
    }
    
    class TxnTrace {
        *uint256 Balance
        *uint256 Nonce
        Hash[] StorageRead
        map[Hash]*uint256 StorageWritten
        *ContractCodeUsage CodeUsage
        *bool SelfDestructed
        map[Hash]struct StorageReadMap
    }
    
    class TxnMeta {
        HexBytes ByteCode
        HexBytes NewTxnTrieNode
        HexBytes NewReceiptTrieNode
        uint64 GasUsed
    }
    
    class TxnInfo {
        map[Address]*TxnTrace Traces
        TxnMeta Meta
    }
    
    class CombinedPreImages {
        HexBytes Compact
    }
    
    class TriePreImage {
        CombinedPreImages Combined
    }
    
    class BlockTrace {
        TriePreImage TriePreImage
        TxnInfo[] TxnInfo
    }

    TxnTrace --> ContractCodeUsage
    TxnInfo o-- TxnTrace
    TxnInfo --> TxnMeta
    BlockTrace --> TriePreImage
    BlockTrace o-- TxnInfo
    TriePreImage --> CombinedPreImages

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[mandrigin]

@cffls that is for the type-2 zero?

[cffls]

Yes, this is for type-2 zero.