fix: Randomize server number to allow client to reconnect

[phala]

This PR introduces two main improvements:

1. Server ID Randomization:

   • Added functionality to randomize the server ID parameter on initial connections and reconnection attempts
   • Implemented a configurable server ID generator for SockJS connections
   • Improved connection retry logic with randomized server IDs to enhance reliability

2. Build System Modernization:

   • Migrated from NWB to Vite for a more modern build system
   • Updated package.json to use standard exports syntax for better compatibility
   • Added proper ESM/CJS/UMD output formats with sourcemaps
   • Removed unnecessary build artifacts and simplified project structure

Additionally, various code improvements were made:

• Initialized handlers object to prevent undefined errors
• Replaced map() with forEach() for side effects
• Improved code formatting and consistency
• Fixed parameter usage in several methods