SWML inbound message webhook

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Payload sent by SignalWire to a SWML messaging webhook URL when an inbound SMS or MMS message arrives on a phone number configured with a SWML message handler. The same payload shape is also used when the SWML messaging `transfer` method targets an external URL — in that case, `params` carries the values supplied to the `transfer` step and `vars` carries the propagated runtime variables from the originating document. The webhook URL is expected to respond with the SWML document to execute for the inbound message.