Support format dropdown and support for rendering traces

[gingerwizard]

This PR adds support for rendering traces in Explore and the traces panel. This is achieved through several changes:

1. Maps, Tuples, and Arrays are now converted to json.RawMessage. This allows tags to rendered correctly. I think this is an improvement and shouldn't impact previous approach - which returned them as a string.
2. For traces to be rendered we need the preferred visualization type to be set - see here and here. We have no good way of detecting the user is querying traces so we introduce a drop down where the user can specify the Format of the response. The default is Auto which means the current behaviour - so no backward compatibility break. If the user specifies the format it overrides the value sent to the server.

Note we maintain full backwards compatibility.

Thus also closes #300

[gingerwizard]

@bossinc my tests pass locally. Can you put the CI failures here please.

[bossinc]

@gingerwizard

Running target: Lint
exec: golangci-lint "run" "./..."
pkg/plugin/driver_test.go:219:16: Error return value of `json.Unmarshal` is not checked (errcheck)
	json.Unmarshal(bytes, &rawJSON)
	              ^
Error: running "golangci-lint run ./..." failed with exit code 1```

[bossinc]

looks great!

[mustafaakin]

Great development, I previously opened a discussion on Grafana but did not think opening an issue here. grafana/grafana#62924

I followed the instructions here to test it locally https://grafana.com/tutorials/build-a-data-source-plugin/ and but from the on the UI I see Plugin unavailable and same in logs and the additional this line: (I use M1 mac)

logger=plugin.loader t=2023-03-22T11:19:39.45338+03:00 level=error msg="Could not start plugin" pluginId=grafana-clickhouse-datasource err="fork/exec /Users/mustafa/projects
       │ /tmp/grafana-plugins/clickhouse-datasource/dist/gpx_clickhouse_darwin_arm64: no such file or directory"

I did not see any info on DEV_GUIDE.md about it. I might be missing a thing.

My plugin/dist folder is as follows:

CHANGELOG.md          README.md             img                   module.js.LICENSE.txt plugin.json
LICENSE               dashboards            module.js             module.js.map

[mshustov]

@mustafaakin maybe Grafana team will help you to run the plugin with Docker. In the meantime, you can try to run Grafana from sources following the guide https://github.com/grafana/grafana/blob/main/contribute/developer-guide.md
Don't forget to add to defaults.ini a path to the plugin folder https://github.com/grafana/grafana/blob/main/conf/defaults.ini#L27 and set allow_loading_unsigned_plugins=clickhouse-datasource