Handle dataframes format if the datasource supports it

[jorgelbg]

While using the latest version (v0.0.9) in our local Grafana setup (8.4/8.5) we found that the metaqueries plugin was not working with the InfluxDB datasource. I believe that the issue that we found was the same as reported in #149.

The root of the problem seems to be that the InfluxDB datasource plugin has been updated to use the new Grafana Dataframes format which means that internally the result of the queries is no longer available in datapoints but instead is available in fields. The internal format of the data inside fields also changed.

At least until now, Elasticsearch is still using the old format (datapoints).

As a side note I've tested the changes included in this PR in a Grafana v9.0.0 container and it seemed to work fine with both datasources (Elasticsearch & InfluxDB):

[moziliar]

Hi, any update on this PR?

[Gauravshah]

@jorgelbg thanks for the contribution. can you please remove unleated changes on package.json. also please make changes on both src & dist.

@ShilpaSivanesan can you please take it forward after the above changes ?

[jorgelbg]

@Gauravshah I reverted the changes to package-lock.json I think these were applied automatically when the lockfileVersion changed.

I also applied the changes to the dist/ directory. For this I relied on the build target: (npm run build) and discarded some changes to the dist/README.md (which seems to be out of sync). I thought that this was going to run as part of the release process so I didn't included in the initial PR.

[Gauravshah]

thanks @jorgelbg @ShilpaSivanesan can you please take it from here ?

[ShilpaSivanesan]

Thanks @jorgelbg Sure @Gauravshah

[martinbruntsch]

anyone out there who can review/approve the PR?

[martinbruntsch]

@Gauravshah , @ShilpaSivanesan any chance to get this into master?