Feat: Support Partial Parsing that allows EIP-7702 as well as custom/less-documented approaches

[prasanna-anchorage]

This is broadly to enable decode "partial subsets" of transactions that are often useful for debugging. I tried to do this with a RLP encoded transaction with cast but I found that alloy-rlp supported this functionality. Thanks @mattsse for the pointer

I don't want to use this at all in the normal path but it's useful for Ethereum for 7702 , 4484 type transaction and other custom cross chain requests that we might encounter. The custom type is used as a catch all for now for any quirky half-transactions we have encountered. Eventually when I support Solana, I'll add per message or instructions parser. At that point, adding a "strategy" or "type" may make sense but I don't want to blow this PR up too much.

Best way to use this is via parser_cli

src/parser/cli && cargo run -- --chain ethereum --transaction 0xdf11800314825208941d0dd7a303374bd5f8c57bd8d16e52316d3bfe74
0180c0 --partial
SignablePayload {
    fields: [
        TextV2 {
            common: SignablePayloadFieldCommon {
                fallback_text: "Custom Chain ID 17",
                label: "Network",
            },
            text_v2: SignablePayloadFieldTextV2 {
                text: "Custom Chain ID 17",
            },
        },
        TextV2 {
            common: SignablePayloadFieldCommon {
                fallback_text: "Custom Partial Transaction (converted to EIP-7702)",
                label: "Transaction Type",
            },
            text_v2: SignablePayloadFieldTextV2 {
                text: "Custom Partial Transaction (converted to EIP-7702)",
            },
        },
        TextV2 {
            common: SignablePayloadFieldCommon {
                fallback_text: "0x1D0Dd7A303374BD5F8C57BD8d16e52316D3Bfe74",
                label: "To Address",
            },
            text_v2: SignablePayloadFieldTextV2 {
                text: "0x1D0Dd7A303374BD5F8C57BD8d16e52316D3Bfe74",
            },
        },
        TextV2 {
            common: SignablePayloadFieldCommon {
                fallback_text: "1 wei",
                label: "Value",
            },
            text_v2: SignablePayloadFieldTextV2 {
                text: "1 wei",
            },
        },
        TextV2 {
            common: SignablePayloadFieldCommon {
                fallback_text: "0",
                label: "Nonce",
            },
            text_v2: SignablePayloadFieldTextV2 {
                text: "0",
            },
        },
        TextV2 {
            common: SignablePayloadFieldCommon {
                fallback_text: "21000",
                label: "Gas Limit",
            },
            text_v2: SignablePayloadFieldTextV2 {
                text: "21000",
            },
        },
        TextV2 {
            common: SignablePayloadFieldCommon {
                fallback_text: "23 wei",
                label: "Max Fee Per Gas",
            },
            text_v2: SignablePayloadFieldTextV2 {
                text: "23 wei",
            },
        },
        TextV2 {
            common: SignablePayloadFieldCommon {
                fallback_text: "20 wei",
                label: "Max Priority Fee Per Gas",
            },
            text_v2: SignablePayloadFieldTextV2 {
                text: "20 wei",
            },
        },
    ],
    payload_type: "EthereumTx",
    subtitle: Some(
        "Custom partial transaction converted to EIP-7702 format",
    ),
    title: "Custom Partial Ethereum Transaction",
    version: "0",
}