Update comet data pipeline schema (#1802)
Update comet data pipeline schema (#1802)

* Improve descriptions.jobs may now handle multiple presql/postsql requests

* Add primary and foreign keys support

* Update comet.json

PrimaryKey is a array of string not a simple string

* Add Schema ref support

* Add schemas as acceptable root

* remove deprecated rots

* Add ability to pushdown the entire task query
schemastore/schemastore,schemastore/schemastore