InfluxDB: SQL Support (#72167)

* Add influxdbSqlSupport feature toggle

* Add SQL option to the config page

* Add SQL backend

* Add metadata support in config page

* Implement unified querying

* Fix healthcheck query

* fsql tests

* secure grpc by default

* code cleanup

* Query handing for sql mode

* Implement a placeholder sql editor

* Fix query language dropdown

* go mod updates

* make lint-go

* more make lint-go

* remove unused runQuery

* switch statements with default case

* linting again

pkg/tsdb/influxdb/fsql/query_model.go

@@ -0,0 +1,59 @@
+package fsql
+
+import (
+	"encoding/json"
+	"fmt"
+	"time"
+
+	"github.com/grafana/grafana-plugin-sdk-go/backend"
+	"github.com/grafana/grafana-plugin-sdk-go/data/sqlutil"
+)
+
+type queryModel struct {
+	*sqlutil.Query
+}
+
+// queryRequest is an inbound query request as part of a batch of queries sent
+// to [(*FlightSQLDatasource).QueryData].
+type queryRequest struct {
+	RefID                string `json:"refId"`
+	RawQuery             string `json:"query"`
+	IntervalMilliseconds int    `json:"intervalMs"`
+	MaxDataPoints        int64  `json:"maxDataPoints"`
+	Format               string `json:"resultFormat"`
+}
+
+func getQueryModel(dataQuery backend.DataQuery) (*queryModel, error) {
+	var q queryRequest
+	if err := json.Unmarshal(dataQuery.JSON, &q); err != nil {
+		return nil, fmt.Errorf("unmarshal json: %w", err)
+	}
+
+	var format sqlutil.FormatQueryOption
+	switch q.Format {
+	case "time_series":
+		format = sqlutil.FormatOptionTimeSeries
+	case "table":
+		format = sqlutil.FormatOptionTable
+	default:
+		format = sqlutil.FormatOptionTimeSeries
+	}
+
+	query := &sqlutil.Query{
+		RawSQL:        q.RawQuery,
+		RefID:         q.RefID,
+		MaxDataPoints: q.MaxDataPoints,
+		Interval:      time.Duration(q.IntervalMilliseconds) * time.Millisecond,
+		TimeRange:     dataQuery.TimeRange,
+		Format:        format,
+	}
+
+	// Process macros and execute the query.
+	sql, err := sqlutil.Interpolate(query, macros)
+	if err != nil {
+		return nil, fmt.Errorf("macro interpolation: %w", err)
+	}
+	query.RawSQL = sql
+
+	return &queryModel{query}, nil
+}