unified-storage: sqlkv skeleton (#115176)

* implement sqlkv skeleton and include sqlkv in badgerkv tests

pkg/storage/unified/resource/sqlkv.go

@@ -0,0 +1,70 @@
+package resource
+
+import (
+	"context"
+	"fmt"
+	"io"
+	"iter"
+
+	"github.com/grafana/grafana/pkg/storage/unified/sql/db"
+)
+
+var _ KV = &sqlKV{}
+
+type sqlKV struct {
+	dbProvider db.DBProvider
+	db         db.DB
+}
+
+func NewSQLKV(dbProvider db.DBProvider) (KV, error) {
+	if dbProvider == nil {
+		return nil, fmt.Errorf("dbProvider is required")
+	}
+
+	ctx := context.Background()
+	dbConn, err := dbProvider.Init(ctx)
+	if err != nil {
+		return nil, fmt.Errorf("error initializing DB: %w", err)
+	}
+
+	return &sqlKV{
+		dbProvider: dbProvider,
+		db:         dbConn,
+	}, nil
+}
+
+func (k *sqlKV) Ping(ctx context.Context) error {
+	return k.db.PingContext(ctx)
+}
+
+func (k *sqlKV) Keys(ctx context.Context, section string, opt ListOptions) iter.Seq2[string, error] {
+	return func(yield func(string, error) bool) {
+		panic("not implemented!")
+	}
+}
+
+func (k *sqlKV) Get(ctx context.Context, section string, key string) (io.ReadCloser, error) {
+	panic("not implemented!")
+}
+
+func (k *sqlKV) BatchGet(ctx context.Context, section string, keys []string) iter.Seq2[KeyValue, error] {
+	return func(yield func(KeyValue, error) bool) {
+		panic("not implemented!")
+	}
+}
+
+func (k *sqlKV) Save(ctx context.Context, section string, key string) (io.WriteCloser, error) {
+	panic("not implemented!")
+}
+
+func (k *sqlKV) Delete(ctx context.Context, section string, key string) error {
+	panic("not implemented!")
+}
+
+func (k *sqlKV) BatchDelete(ctx context.Context, section string, keys []string) error {
+	panic("not implemented!")
+}
+
+func (k *sqlKV) UnixTimestamp(ctx context.Context) (int64, error) {
+	panic("not implemented!")
+}