Add block viz filter UI

frontend/src/app/components/mempool-block-overview/mempool-block-overview.component.html

@@ -5,6 +5,7 @@
   [blockLimit]="stateService.blockVSize"
   [orientation]="timeLtr ? 'right' : 'left'"
   [flip]="true"
+  [showFilters]="showFilters"
   [overrideColors]="overrideColors"
   (txClickEvent)="onTxClick($event)"
 ></app-block-overview-graph>

frontend/src/app/components/mempool-block-overview/mempool-block-overview.component.ts

@@ -18,6 +18,7 @@ import TxView from '../block-overview-graph/tx-view';
 })
 export class MempoolBlockOverviewComponent implements OnInit, OnDestroy, OnChanges, AfterViewInit {
   @Input() index: number;
+  @Input() showFilters: boolean = false;
   @Input() overrideColors: ((tx: TxView) => Color) | null = null;
   @Output() txPreviewEvent = new EventEmitter<TransactionStripped | void>();