feat: Enhance speech-to-text example with live microphone transcription

- Add live microphone recording and transcription functionality
- Implement audio buffer processing with 5-second intervals
- Update SpeechToText initialization with more flexible configuration
- Add TypeScript type definitions for node-record-lpcm16
- Improve error handling and process management for audio recording

src/types/node-record-lpcm16.d.ts

@@ -0,0 +1,22 @@
+declare module 'node-record-lpcm16' {
+    import { Readable } from 'stream';
+
+    interface RecordOptions {
+        sampleRate?: number;
+        channels?: number;
+        audioType?: string;
+        threshold?: number;
+        thresholdStart?: number;
+        thresholdEnd?: number;
+        silence?: number;
+        verbose?: boolean;
+        recordProgram?: string;
+    }
+
+    interface Recording {
+        stream(): Readable;
+        stop(): void;
+    }
+
+    export function record(options?: RecordOptions): Recording;
+}