Team Guardian: Refactor it to remove the bus dependency (#43058)

* Refactor team guardian to avoid to use bus

* Fix lint

* Fix lint

pkg/services/teamguardian/database/database.go

@@ -0,0 +1,22 @@
+package database
+
+import (
+	"context"
+
+	"github.com/grafana/grafana/pkg/models"
+	"github.com/grafana/grafana/pkg/services/sqlstore"
+)
+
+type TeamGuardianStoreImpl struct{}
+
+func ProvideTeamGuardianStore() *TeamGuardianStoreImpl {
+	return &TeamGuardianStoreImpl{}
+}
+
+func (t *TeamGuardianStoreImpl) GetTeamMembers(ctx context.Context, query models.GetTeamMembersQuery) ([]*models.TeamMemberDTO, error) {
+	if err := sqlstore.GetTeamMembers(ctx, &query); err != nil {
+		return nil, err
+	}
+
+	return query.Result, nil
+}