Add total sum to mempool chart.

Add zoom tools.
Add different theme for charts `big` and `small` (default).
Fix date format on mouseover.
Fix animations on graphs page.
Fix overflow tv page.
Remove `crosshair` on mouseover, changed to `line`.
Fix custom tooltip styles.
Remove inverted button (will add in a future PR).
Remove fee range labels (will add in a future PR).
Fix e2e testing.

frontend/src/app/components/mempool-graph/mempool-graph.component.html

@@ -1 +1 @@
-<div class="echarts" echarts [options]="mempoolVsizeFeesOptions"></div>
+<div echarts class="echarts" (chartInit)="onChartReady($event)" [options]="mempoolVsizeFeesOptions"></div>