Add optional "deliveryMode" support for activity posting #443
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Description:
This change introduces support for the deliveryMode property when posting activities through the Direct Line SDK.
Background
Azure Bot Service (ABS) is adding support for streaming responses via Direct Line. To enable this, clients must set deliveryMode: "stream" and use the activity protocol on POST /activities requests.
Currently, the DirectLineJS SDK does not expose deliveryMode as a configurable property, which prevents clients from opting into streaming.
Changes in this PR
Delivery mode doc - https://github.com/microsoft/Agents/blob/main/specs/activity/protocol-activity.md#delivery-mode