Parity in REST API for Dataflows with similar capabilities as DataSets

The dataflows REST API is missing a lot of functionality available for DataSets. Examples of these are:

1. Bind to Gateway/Bing to Gateway in Group (https://docs.microsoft.com/en-us/rest/api/power-bi/datasets/bindtogatewayingroup)
2. Update DataSources in Group (https://docs.microsoft.com/en-us/rest/api/power-bi/datasets/updatedatasourcesingroup)

Basically full parity with Datasets, so that we can automate the deployment of dataflows using scripts/devops pipelines.

Please see this issue for an example of what is blocked currently: https://community.powerbi.com/t5/Service/Is-there-a-way-to-automate-the-setting-of-dataflow-datasource/m-p/1302270