[feature]: Support MPP record (alias Payment_Address) for more RPC calls

We should always enforce MPP payments because they include the payment_secret which has been introduced a while ago and therefore we should also be able to include the MPP record in the following RPC-Calls.

They are now required in the specification for writer and reader of an invoice, and when sending via a route we should also make sure we include an MPP record.

relates to https://github.com/lightningnetwork/lnd/pull/9752

Tasks to do:

1. QueryRoutes should support including an MPP record (payment_addr) when querying the route which can then be used in SendToRoute
2. SendToRoute should also enforce an MPP record.

Extras:

3. Allow AMP Record in buildroute
4. Allow Setting AMP record for QueryRoutes
5. Allow SendToRoute with an AMP record