Add gbHours metrics to functions

src/routes/console/project-[project]/functions/function-[function]/usage/[[period]]/+page.svelte

@@ -9,6 +9,8 @@
     export let data: PageData;
     $: total = data.executionsTotal;
     $: count = data.executions;
+    $: gbHoursTotal = data.executionsMbSecondsTotal / 1000 / 3600;
+    $: mbSecondsCount = data.executionsMbSeconds;
 </script>
 
 <Container>
@@ -46,4 +48,24 @@
                 ]} />
         </Card>
     {/if}
+
+    <div class="u-flex u-main-space-between common-section">
+        <Heading tag="h2" size="5">GB Hours</Heading>
+    </div>
+    {#if count}
+        <Card>
+            <Heading tag="h6" size="6">{formatNumberWithCommas(gbHoursTotal)}</Heading>
+            <p>GB Hours</p>
+            <div class="u-margin-block-start-16" />
+            <BarChart
+                series={[
+                    {
+                        name: 'Count of gbHours over time',
+                        data: [...mbSecondsCount.map((e) => [e.date, 
+                        Math.ceil((e.value / 1000 / 3600) * 1000) / 1000
+                    ])]
+                    }
+                ]} />
+        </Card>
+    {/if}
 </Container>