Common AWS SQL Datasources

[andresmgot]

See design document at: https://docs.google.com/document/d/1V3SJGER5zIEQ_x-jHTE3gUIOvDMYqeYFsG4jxtTdux4/edit#

The objective of the refactoring is to reduce the amount of time spent on maintaining and developing new and existing SQL data sources for AWS, having a bigger source of common code.

Chores:

• [x] https://github.com/grafana/grafana-aws-sdk/issues/27
• [x] https://github.com/grafana/grafana-aws-sdk/issues/26

Backend

• [x] Create an API package with a common interface
• [x] Create a Driver package with a basic interface
• [x] Create a “routes” package with common routes
• [x] Create a datasource package for handling connections
• [x] Expose method to set the User-Agent header https://github.com/grafana/grafana-aws-sdk/pull/36

Frontend

• [x] ResourceSelector component
• [x] ConfigEditor component
• [x] QueryCodeEditor component
• [x] QueryEditor component (with support for examples)
• [x] Suggestions utils - [ ] VariableSupport class
• [x] Datasource class

Athena

• [x] Migrate plugin to use the common packages

Redshift

• [x] Migrate plugin to use the common packages

Timestream - [ ] Migrate plugin to use sqlds (requires a golang SQL driver) - [ ] Migrate plugin to use the common packages

[andresmgot]

Created a different issue/epic for Timestream: https://github.com/grafana/timestream-datasource/issues/124

So we can consider this done.