Make storage async

src/storage/database.ts

@@ -1,6 +1,6 @@
 export interface DatabaseAPI {
     set(collection: string, key: string, value: any): void;
-    get(collection: string, key: string): string;
+    get(collection: string, key: string): Promise<string>;
     delete(collection: string, key: string): void;
     flush(): void;
 }

src/storage/keyring.ts

@@ -1,6 +1,6 @@
 export interface KeyringAPI {
     set(key: string, value: any): void;
-    get(key: string): string;
-    getAll(): string[];
+    get(key: string): Promise<string>;
+    getAll(): Promise<string[]>;
     delete(key: string): void;
 }

src/storage/keyvalue.ts

@@ -1,6 +1,6 @@
 export interface KeyValueAPI {
     set(key: string, value: any): void;
-    get(key: string): string;
+    get(key: string): Promise<string>;
     delete(key: string): void;
     flush(): void;
 }