feat: add ds query tool, and update dashboard query extraction for more

[kissghosts]

Add Custom Datasource Query Tool with Raw Data Support

Key Changes:

1. Datasource Query Implementation: Added a general query tool that directly calls Grafana's /api/ds/query endpoint using HTTP requests
   • returns the complete monitoring data including meta info, actual metrics, and time series data (compatibility with all Grafana-supported datasource types)
   • Added more comprehensive descriptions for better tool discoverability
   • Not use the official Grafana OpenAPI client: QueryMetricsWithExpressionsWithParams method in grafana-openapi-client-go only returns metadata information without the actual monitoring data.
2. Update parameter handling for searching datasource panel queries: the original one only supports Prometheus-style queries

[CLAassistant]

All committers have signed the CLA.

[sd2k]

Thanks for adding this. I think it is absolutely the right direction for queries, to be honest, rather than us adding custom tools for every datasource.

My concern is that there is no programmatically obtainable registry of schemas for queries, so it's up to the LLM to guess / figure this out, which isn't great. What I'd really like to do is work with the Grafana plugins folks and make it possible for datasources to expose a JSONSchema for their query objects, so we can provide that to the LLM alongside the 'list datasources' tool or something similar. Until then I fear this tool would fail often for more obsure datasources, and be less effective than dedicated ones for Prometheus/Loki/Tempo.

Have you been running this version at all? Have you found it to work well? Perhaps we could get some end-to-end tests in to see how well it works for different models, datasources and queries. (We need to fix our e2e tests first though 😞 )