Changes to GET /v1/external/campaigns/:agent_id/:campaign_id/calls

added the required property data/calls/items/created_at to the response with the 200 status

added the required property data/calls/items/duration to the response with the 200 status

added the required property data/calls/items/ended_at to the response with the 200 status

added the required property data/calls/items/started_at to the response with the 200 status

added the required property data/calls/items/updated_at to the response with the 200 status

endpoint added

api path removed without deprecation