made tab context menu extensible

terminus-core/src/api/tabContextMenuProvider.ts

@@ -0,0 +1,8 @@
+import { BaseTabComponent } from '../components/baseTab.component'
+import { TabHeaderComponent } from '../components/tabHeader.component'
+
+export abstract class TabContextMenuItemProvider {
+    weight = 0
+
+    abstract async getItems (tab: BaseTabComponent, tabHeader?: TabHeaderComponent): Promise<Electron.MenuItemConstructorOptions[]>
+}