Implement local quoting

[mkurapov]

Context

We will be adding a "local" payment method. The payment handler method service needs to support two methods, getQuote and pay. This issue is about implementing the local quote method in a new "local" payment method handler, which just needs to do the conversion between the sending wallet address and the incoming payment.

Internally, we should be able to differentiate whether a local quote or local payment happened under the hood. Keep in mind, the outgoingPayment.id references (has a FK relationship) to quote.id (the outgoing payment id is actually equal to the quote id)