chore: rename custom_records to tlv_records

[bumi]

This makes it more consistent with the usage in the keysend functions

[rolznz]

@bumi if we want to make it consistent I would also change the layout of the TLV records to match the NIP-47 spec. Is that ok? I can make the change.

"tlv_records: [ // tlv records, optional
            {
                "type": 5482373484, // tlv type
                "value": "0123456789abcdef" // hex encoded tlv value
            }
        ]

[bumi]

true, makes sense. can you add this?

(damn, then I need to convert it back in the rails app to handle it like lndhub/lnd :) )

[rolznz]

@bumi updated here and getAlby/lightning-browser-extension#3172