Add TypeScript Homebridge v2 platform plugin for Baytech RPC3 that wraps existing Python scripts

[pponce]

Motivation

• Provide a native Homebridge 2.0 dynamic platform that reuses the existing Python RPC3 scripts while exposing outlets and reboot switches to HomeKit.
• Avoid concurrent telnet operations by serializing script calls and reduce RPC3 load via per-outlet caching and configurable polling.
• Consolidate repository into an npm-installable plugin with build scripts and TypeScript sources.

Description

• Add a new TypeScript Homebridge plugin (src/index.ts, src/platform.ts, src/rpc3-client.ts, src/settings.ts) that registers the RPC3Control dynamic platform and manages Outlet and Switch accessories.
• Implement Rpc3Client which calls the existing Python scripts via child_process.execFile to run control.py and state.py, and a queue (enqueue) to serialize all script invocations.
• Implement per-outlet state caching with TTL and periodic refresh via a configurable pollIntervalMs, and stateless reboot switches that auto-reset after issuing a reboot command.
• Add project metadata and build configuration (package.json, tsconfig.json), update documentation (README) with plugin usage and configuration examples, and introduce a .gitignore for common artifacts.

Testing

• Ran the TypeScript build with npm run build to compile src into dist and the build completed successfully.
• No automated unit tests were included in this change set.

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Codex Task