Trustless concerns in daemon

[markettes]

I have two concerns regarding the trustless processes in 40swapd:

• Status is get by doing polling to 40swap server, therefore we rely on what we receive from 40swap as the source of truth which makes the daemon not fully trustless.
• The claim transaction is serialized and sent to 40swap to be published by the server. We could use the LND node to publish the transaction and make it even more trustless.

[alejandroacho]

I have two concerns regarding the trustless processes in 40swapd:

• Status is get by doing polling to 40swap server, therefore we rely on what we receive from 40swap as the source of truth which makes the daemon not fully trustless.
• The claim transaction is serialized and sent to 40swap to be published by the server. We could use the LND node to publish the transaction and make it even more trustless.

This PR solves the second point: #168