[add] Add outbound_fee, gas_fee_units and outbound_tx_size to /inbound_addresses endpoint

Closes #1405 (closed) + #1406 (closed)

Example response:

    {
        "address": "qplmf86d765hdc8hs4dhmkdf29akja2eyqs7h35xy4",
        "chain": "BCH",
        "gas_rate": "513",
        "gas_rate_units": "satsperbyte",
        "halted": false,
        "outbound_fee": "1539000",
        "outbound_tx_size": "1500",
        "pub_key": "tthorpub1addwnpepqvr7gpfk3rlz7md37xqpk0v4k9c6gu4334emcpnwhd05523e8ph272fmr6v"
    },
    {
        "address": "tbnb1076f7n0k49mwpau9td7an2230d5h2kfqvum5wp",
        "chain": "BNB",
        "gas_rate": "56250",
        "gas_rate_units": "ubnb",
        "halted": false,
        "outbound_fee": "112500",
        "outbound_tx_size": "1",
        "pub_key": "tthorpub1addwnpepqvr7gpfk3rlz7md37xqpk0v4k9c6gu4334emcpnwhd05523e8ph272fmr6v"
    },
    {
        "address": "0xb73de64c35a60d964b26482d745f4f870e47207f",
        "chain": "ETH",
        "gas_rate": "30",
        "gas_rate_units": "gwei",
        "halted": false,
        "outbound_fee": "4800000",
        "outbound_tx_size": "80000",
        "pub_key": "tthorpub1addwnpepqvr7gpfk3rlz7md37xqpk0v4k9c6gu4334emcpnwhd05523e8ph272fmr6v",
        "router": "0xE65e9d372F8cAcc7b6dfcd4af6507851Ed31bb44"
    },