Fix secondary promise timeouts

[drizzentic]

fix: resolve HTTP request timeouts and connection issues

This commit addresses several critical issues in the OpenHIM routing system:

1. Fixed socket hangup errors by creating fresh connection agents for each request
2. Resolved timeout issues by extending server socket timeouts and improving promise handling
3. Added support for Brotli compression to handle all content encoding types
4. Implemented robust error handling for secondary routes to prevent transaction failures
5. Fixed duplicate requests by removing problematic await statements and properly chaining promises
6. Added comprehensive logging for better diagnostics and troubleshooting
7. Improved secondary route processing to ensure transactions complete even when routes fail

These changes significantly improve the reliability of the routing system,
particularly for secondary routes that depend on primary route responses.

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