feat(appui-tabs): add support for left/right tab action buttons and content tab action APIs

ts_web/elements/00group-appui/dees-appui-maincontent/dees-appui-maincontent.ts

@@ -53,6 +53,12 @@ export class DeesAppuiMaincontent extends DeesElement {
   @property({ type: Number })
   accessor tabsAutoHideThreshold: number = 0;
 
+  @property({ type: Array })
+  accessor tabActionsLeft: interfaces.ITabAction[] = [];
+
+  @property({ type: Array })
+  accessor tabActionsRight: interfaces.ITabAction[] = [];
+
   public static styles = [
     themeDefaultStyles,
     cssManager.defaultStyles,
@@ -106,6 +112,8 @@ export class DeesAppuiMaincontent extends DeesElement {
             .tabStyle=${'horizontal'}
             .autoHide=${this.tabsAutoHide}
             .autoHideThreshold=${this.tabsAutoHideThreshold}
+            .actionsLeft=${this.tabActionsLeft}
+            .actionsRight=${this.tabActionsRight}
             @tab-select=${(e: CustomEvent) => this.handleTabSelect(e)}
             @tab-close=${(e: CustomEvent) => this.handleTabClose(e)}
           ></dees-appui-tabs>