Support new forecasting endpoints #179
Description
New forecasting API endpoints were introduced in the FlexMeasures server: [POST] /sensors/(id)/forecasts/trigger <api/v3_0.html#post--api-v3_0-sensors-id-forecasts-trigger>_ and [GET] /sensors/(id)/forecasts/(uuid) <api/v3_0.html#get--api-v3_0-sensors-id-forecasts-uuid>_ to forecast sensor data [see PR #1813 <https://www.github.com/FlexMeasures/flexmeasures/pull/1813>, PR #1823 <https://www.github.com/FlexMeasures/flexmeasures/pull/1823> and PR #1917 <https://www.github.com/FlexMeasures/flexmeasures/pull/1917>_]. We need to support these endpoints in the FlexMeasures client.