Handle automatic consent for transactions

[mattrussell36]

• Where to prompt the user initiallly
• Where to change this setting later

[candida-d]

@ValentinTrinque proposed this would be an advanced feature, in a “danger zone” in the future “config / preferences page”

[ValentinTrinque]

That's right. It can be implemented later. And I think, as Candida mentioned, a danger zone is the way to go.

[candida-d]

We've had some feedback (on behalf of multiple users) requesting this option for the desktop wallet app - vegaprotocol/feedback#114