[feature]: Try all channels when adding an invoice and a channel fails because of no inbound policy

[ziggie1984]

When multiple channels exist for the same peer with the same asset_id, we attempt the first channel. However, if it fails due to the absence of an inbound policy, we stop further attempts.

We fetch the channels here:

taproot-assets/rpcserver.go

Line 7137 in ee06af7

assetChan, err := r.rfqChannel(ctx, assetID, peerPubKey)

We successfully fetch the first result, but if a downstream failure occurs due to the absence of an inbound channel policy for a particular channel, all other channels of the same peer become unusable until the problematic channel is closed.

taproot-assets/rpcserver.go

Line 7215 in ee06af7

inboundPolicy, err := r.getInboundPolicy(

Expected behaviour:

Try all available channels before reporting an error.

[Roasbeef]

Duplicate of #1052?

[ziggie1984]

Similar, 1052 wants to even allow more than 1 peer, but this Issue just relates to the fact if we have more than 1 channel witth the same peer, and the first selected has no policy, we will abort and have no ability to use the other channels with the peer (which might have a policy in place)

[ZZiigguurraatt]

Is there ever going to be a case where there will be a different quote/rate on different channels from the same peer? Wondering in that case if similar prioritization logic as is suggested in #1052 should be considered?