CloudWatch: move QueryData input parsing types to separate package (#57165)

* CloudWatch: move parse request types separate package

* Move metric query constants, unexport metricDataQuery json decoding type

* Unexport isSearchExpression

pkg/tsdb/cloudwatch/metric_data_input_builder_test.go

@@ -6,9 +6,11 @@ import (
 
 	"github.com/aws/aws-sdk-go/aws"
 	"github.com/aws/aws-sdk-go/service/cloudwatch"
-	"github.com/grafana/grafana/pkg/services/featuremgmt"
 	"github.com/stretchr/testify/assert"
 	"github.com/stretchr/testify/require"
+
+	"github.com/grafana/grafana/pkg/services/featuremgmt"
+	"github.com/grafana/grafana/pkg/tsdb/cloudwatch/models"
 )
 
 func TestMetricDataInputBuilder(t *testing.T) {
@@ -34,7 +36,7 @@ func TestMetricDataInputBuilder(t *testing.T) {
 
 			from := now.Add(time.Hour * -2)
 			to := now.Add(time.Hour * -1)
-			mdi, err := executor.buildMetricDataInput(from, to, []*cloudWatchQuery{query})
+			mdi, err := executor.buildMetricDataInput(from, to, []*models.CloudWatchQuery{query})
 
 			assert.NoError(t, err)
 			require.NotNil(t, mdi)