Adding router proxy support

[cx-serhii-stanislavskyi]

Add Router Proxy Configuration from Environment Variables

This PR adds two new functions to improve router connectivity options:

Changes

1. Added routerProxyFromEnvironment function

   • Enables automatic proxy configuration for router connections based on environment variables
   • Uses HTTPS_PROXY or HTTP_PROXY environment variables to determine proxy settings
   • Automatically applied when loading configuration from file via NewConfigFromFile()

2. Added parseTLS(raw string) helper function

   • Supports router URLs with the format tls:router.example.com:443
   • Converts tls: scheme URLs to proper HTTPS URLs for processing
   • Enables more flexible router addressing options

Use Cases

• Simplifies deployment in environments where direct connections are restricted and proxies are required
• Allows for consistent proxy configuration across applications using environment variables
• Supports more intuitive TLS connection specification with the tls: URL format

These changes maintain backward compatibility while adding flexibility for different network configurations.