An interval of a CustomPacingCurve. A custom pacing goal contains a start time and an
            amount. The goal will apply until either the next custom pacing goal's getStartTime or
            the line item's end time if it is the last goal.
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               https://www.google.com/apis/ads/publisher/v202502
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                            | The start date and time of the goal. This field is required unless  | 
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                            Whether the LineItem.startDateTime should be used for the start date and time of this
                goal. This field is not persisted and if it is set to true, the  | 
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