feat: Refactor BedHardware to support both Serial and MQTT implementations

- Added MQTT support to BedHardware, allowing for connection to MQTT brokers.
- Created BedHardwareMQTT and BedHardwareSerial classes to handle respective connections.
- Introduced a unified BedHardwareConfig interface for configuration management.
- Implemented event forwarding from the underlying implementations to the BedHardware class.
- Added MQTT adapter for handling MQTT connections and message subscriptions.
- Updated package.json to include the mqtt library as a dependency.
- Created a singleton MQTTService for managing MQTT client instances.
- Enhanced error handling and logging throughout the BedHardware and MQTT classes.

types/bedhardware.ts

@@ -0,0 +1,53 @@
+export interface PinState {
+  pin: number;
+  state: number;
+  name: string;
+  timestamp: Date;
+}
+
+export interface PinChange {
+  pin: number;
+  previousState: number;
+  currentState: number;
+  timestamp: Date;
+}
+
+export interface BedHardwareConfig {
+  type: 'serial' | 'mqtt';
+  serial?: {
+    portPath: string;
+    baudRate?: number;
+  };
+  mqtt?: {
+    topics?: {
+      pinState: string;
+      pinChange: string;
+      initialization: string;
+    };
+  };
+}
+
+export interface IBedHardware {
+  connect(): Promise<void>;
+  disconnect(): Promise<void>;
+  getPinState(pin: number): PinState | undefined;
+  getAllPinStates(): PinState[];
+  isConnected(): boolean;
+  
+  // Event emitter methods  on(event: 'connected', listener: () => void): this;
+  on(event: 'disconnected', listener: () => void): this;
+  on(event: 'error', listener: (error: Error) => void): this;
+  on(event: 'initialized', listener: () => void): this;
+  on(event: 'pinInitialized', listener: (pinState: PinState) => void): this;
+  on(event: 'pinChanged', listener: (pinChange: PinChange) => void): this;
+  on(event: string, listener: (...args: unknown[]) => void): this;
+    emit(event: 'connected'): boolean;
+  emit(event: 'disconnected'): boolean;
+  emit(event: 'error', error: Error): boolean;
+  emit(event: 'initialized'): boolean;
+  emit(event: 'pinInitialized', pinState: PinState): boolean;
+  emit(event: 'pinChanged', pinChange: PinChange): boolean;
+  emit(event: string, ...args: unknown[]): boolean;
+}
+
+export type BedHardwareType = 'serial' | 'mqtt';