Promptless message signing

[broody]

When signing a typed message, webauthn is used so a prompt is displayed. We can enable a way to sign the message with the session key instead and avoid the prompt.

[rsodre]

this is an example of a message we sign every time players make a move, to generate a salt.
maybe the controller could auto-sign by domain name, if we add it to policies?

{
    "primaryType": "Message",
    "domain": {
        "revision": "1",
        "name": "Underware",
        "chainId": "WP_PISTOLS_STAGING",
        "version": "0.1.0"
    },
    "types": {
        "StarknetDomain": [
            {
                "name": "revision",
                "type": "shortstring"
            },
            {
                "name": "name",
                "type": "shortstring"
            },
            {
                "name": "chainId",
                "type": "shortstring"
            },
            {
                "name": "version",
                "type": "shortstring"
            }
        ],
        "Message": [
            {
                "name": "duelId",
                "type": "felt"
            },
            {
                "name": "roundNumber",
                "type": "felt"
            },
            {
                "name": "duelistId",
                "type": "felt"
            }
        ]
    },
    "message": {
        "duelId": "0x15c9fea7d74ee59",
        "roundNumber": "0x1",
        "duelistId": "0xb"
    }
}

[rsodre]

bump!

Signing typed data is very useful, and essential for us to create a deterministic local secret for each player

Using touch id on a Macbook is easy, but players using other auth methods will be pissed about doing it all the time.