graph/db: validate edge policy TLV data before persisting

In this commit, we start validating the extra opaque data of a channel
edge policy before persisting it. We just check that the data is valid
TLV.

NOTE: we recently [started
validating](https://github.com/lightningnetwork/lnd/commit/1410a0949d555e14de11faf81a17fe64917505e3)
this at the lnwire level. So really, no new update will reach the DB
layer without this already being checked. But we check it again here so
that the DB API behaves correctly as its own unit.

graph/db/kv_store.go

@@ -4546,6 +4546,12 @@ func serializeChanEdgePolicy(w io.Writer, edge *models.ChannelEdgePolicy,
 		}
 	}
 
+	// Validate that the ExtraOpaqueData is in fact a valid TLV stream.
+	err = edge.ExtraOpaqueData.ValidateTLV()
+	if err != nil {
+		return fmt.Errorf("%w: %w", ErrParsingExtraTLVBytes, err)
+	}
+
 	if len(edge.ExtraOpaqueData) > MaxAllowedExtraOpaqueBytes {
 		return ErrTooManyExtraOpaqueBytes(len(edge.ExtraOpaqueData))
 	}