Implement configurable DNS policy rule matching order and refactor
upstreamFor method for better maintainability.
New features:
- Add MatchingConfig to ListenerPolicyConfig for rule order configuration
- Support custom rule evaluation order (network, mac, domain)
- Add stop_on_first_match configuration option
- Hidden from config files (mapstructure:"-" toml:"-") for future release
Code improvements:
- Create upstreamForRequest struct to reduce method parameter count
- Refactor upstreamForWithConfig to use single struct parameter
- Improve code readability and maintainability
- Maintain full backward compatibility
Technical details:
- String-based configuration converted to RuleType enum internally
- Default behavior preserved (network → mac → domain order)
- Domain rules still override MAC/network rules regardless of order
- Comprehensive test coverage for configuration integration
The matching configuration is programmatically accessible but hidden
from user configuration files until ready for public release.
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