[construction] Support public_keys in /construction/metadata options

[stefanmendoza]

Summary

Adding support for pulling the public_keys from the options in /construction/metadata.

Example

With public_keys provided

POST http://localhost:8080/construction/metadata

Request:

{
    "network_identifier": {
        "blockchain": "vara",
        "network": "testnet"
    },
    "public_keys": [
        {
            "hex_bytes": "6b476b66796d46714234614256756e5843573639457a515244746b5a6b5551423434474234584a6e774e77716d5779524e",
            "curve_type": "edwards25519"
        }
    ]
}

Response:

{
    "metadata": {
        "nonce": 0,
        "blockHash": "0x2ce823ec9e56c3885c2eae5b3ef0de53b9a858cd919aa03e58d8b348249d9ff8",
        "blockNumber": 2806228,
        "eraPeriod": 105
    }
}

With public_keys in options

POST http://localhost:8080/construction/metadata

Request:

{
    "network_identifier": {
        "blockchain": "vara",
        "network": "testnet"
    },
    "options": {
        "public_keys": [
            "6b476b66796d46714234614256756e5843573639457a515244746b5a6b5551423434474234584a6e774e77716d5779524e"
        ]
    }
}

Response:

{
    "metadata": {
        "nonce": 0,
        "blockHash": "0xf8e13dda214658a1c54f866a473bd9952238011aeb61601d141a48d7c6024507",
        "blockNumber": 2806243,
        "eraPeriod": 105
    }
}

Error Handling

POST http://localhost:8080/construction/metadata

Request:

{
    "network_identifier": {
        "blockchain": "vara",
        "network": "testnet"
    }
}

Response:

{
    "code": 612,
    "message": "No public key was provided",
    "retriable": false
}