[Feature Request] Dynamic datasource

[qbx2]

Original issue by @devendrakhatri: openblocks-dev/openblocks#297

For the use cases where we have multiple environments (DEV, UAT, PROD) and each environment has a dedicated database with exactly same schema.
Is it possible to build one dashboard with an option to switch between environments ?
With current datasource capability, looks like dashboard is tightly coupled with a specific database.

Can we think of passing datasource dynamically?

Probably we can call it "environment manager" which can manage all the base URLs, database,. etc. at single place and dashboard can switch to environments using dropdown list?

Environment	Service 1	Database 1	Database 2
DEV	S1_DS_Dev	D1_DB_Dev	D2_DB_Dev
UAT	SX_DS_Uat	D1_DB_Uat	D2_DB_Uat
PROD	SY_DS_Prod	D1_DB_Prod	D2_DB_Prod