routing: assume TLV onion feature bit

[ellemouton]

In this PR, we start assuming that hops on a path all support TLV onion encoding.

This PR is the bare minimum. It does not completely remove the Hop.LegacyPayload member since we do still use this for deserialising persisted Hops for an HTLC attempt. So there is a chance that we have some on disk. And since we do have cases where we assume hops only support legacy encoding (either we did not receive their node announcement or we received chained hop hints in an invoice) the chances of this being the case are not that small. So some discussion/thought is perhaps needed around how we can handle this.

The other thing we could potentially add to this PR is the removal of --protocol.legacy.onion

We already no longer read the TlvPayload boolean in SendToRouteReq.Hop so we could potentially remove this or warn the user if they are setting this to false that it is being ignored.

Fixes: https://github.com/lightningnetwork/lnd/issues/8785

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[lightninglabs-deploy]

@yyforyongyu: review reminder

[JssDWt]

Tested with the test setup described in https://github.com/lightningnetwork/lnd/issues/8785, it fixes the issue.

[ellemouton]

awesome - thanks for testing @JssDWt 🚀