console: factor graphXXXHandlerInput

This is similar to what is done in TypeScript.

console/graph.go

@@ -0,0 +1,23 @@
+// SPDX-FileCopyrightText: 2023 Free Mobile
+// SPDX-License-Identifier: AGPL-3.0-only
+
+package console
+
+import (
+	"time"
+
+	"akvorado/common/schema"
+	"akvorado/console/query"
+)
+
+// graphCommonHandlerInput is for bits common to graphLineHandlerInput and
+// graphSankeyHandlerInput.
+type graphCommonHandlerInput struct {
+	schema     *schema.Component
+	Start      time.Time      `json:"start" binding:"required"`
+	End        time.Time      `json:"end" binding:"required,gtfield=Start"`
+	Dimensions []query.Column `json:"dimensions"`            // group by ...
+	Limit      int            `json:"limit" binding:"min=1"` // limit product of dimensions
+	Filter     query.Filter   `json:"filter"`                // where ...
+	Units      string         `json:"units" binding:"required,oneof=pps l3bps l2bps inl2% outl2%"`
+}