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]

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