Add storage support

Signed-off-by: Sanjula Ganepola <sanjulagane@gmail.com>

src/storageManager.ts

@@ -1,5 +1,9 @@
 import { ExtensionContext } from "vscode";
 
+export enum StorageKey {
+    WorkspaceHistory = 'workspaceHistory'
+}
+
 export class StorageManager {
     private context: ExtensionContext;
     private storageKey: string = 'githubLocalActions';
@@ -12,11 +16,11 @@ export class StorageManager {
         return this.context.globalState.keys();
     }
 
-    get<T>(key: string): T | undefined {
+    get<T>(key: StorageKey): T | undefined {
         return this.context.globalState.get<T>(`${this.storageKey}.${key}`);
     }
 
-    async update(key: string, value: any): Promise<void> {
+    async update(key: StorageKey, value: any): Promise<void> {
         await this.context.globalState.update(`${this.storageKey}.${key}`, value);
     }
 }