Pass query args to GetAsyncDB

[kevinwcyu]

Work for Athena query result reuse work.

This passes the ConnectionArgs to the Datasource's GetAsyncDB method. The ConnectionArgs are specific to a query. Currently, synchronous queries already get the connection args (this is handled in sqlds https://github.com/grafana/sqlds/blob/f35c5a62f66c02aef63b260c1e0a25568ae698b6/datasource.go#L169).

[CLAassistant]

All committers have signed the CLA.

[CLAassistant]

Thank you for your submission! We really appreciate it. Like many open source projects, we ask that you sign our Contributor License Agreement before we can accept your contribution.
_{You have signed the CLA already but the status is still pending? Let us recheck it.}

[fridgepoet]

I notice that near line 146, GetDBFromQuery in sqlds itself has the connection args that you originally linked in sqlds. What is the difference between the db there and the asyncDB from GetAsyncDB?

[kevinwcyu]

I notice that near line 146, GetDBFromQuery in sqlds itself has the connection args that you originally linked in sqlds. What is the difference between the db there and the asyncDB from GetAsyncDB?

@fridgepoet, the db is an actual sql connection i believe. whereas the asyncDB provides the methods for the async flow, i.e. starting a query, getting its status, etc.