Update trampoline to use official spec values #2819
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Use the feature bit and tlvs defined in the official spec PR (lightning/bolts#836). Add support for the spec test vector.
This PR is incomplete: we also need to actually use the official feature bit (in conjunction with the experimental one) and integrate the onion errors defined by lightning/bolts#836. We also need to think about backwards-compatibility when relaying trampoline payments to older Phoenix nodes (we should write the trampoline TLV with the old tag).