fix(qqbot): declare silk-wasm codec types

extensions/qqbot/src/types/silk-wasm.d.ts

@@ -0,0 +1,12 @@
+declare module "silk-wasm" {
+  export type SilkCodecResult = {
+    data: Uint8Array;
+    duration: number;
+  };
+
+  export function isSilk(input: Uint8Array): boolean;
+
+  export function decode(input: Uint8Array, sampleRate: number): Promise<SilkCodecResult>;
+
+  export function encode(input: Uint8Array, sampleRate: number): Promise<SilkCodecResult>;
+}