Expose APIs for pipeline controller

[fredhersch]

Expose set of APIs on the pipeline controller to enable integration with different systems and make these accessible through REST APIs.

Plus provide demonstration with existing Global Goods

This is a prerequisite for #632.

[imvignesh003]

Hey @fredhersch,
Now currently these REST API's are exposed from pipelines Controller. /run,/status, /tables, /download-error-log, /test-view...
Can you be detailed on what API's to create
Thank you

[bashir2]

An incomplete list of endpoints that needs to be added:

• /config with required arguments to read the value of a config param.
• /dwh with different operations for listing the current data-warehouse snapshots and deleting older ones.
• /next to fetch the time for the next scheduled incremental run.