Add pattern matching support to Net::HTTP

[baweaver]

This PR adds deconstruct_keys to Net::HTTP, enabling pattern matching on HTTP client configuration and state.

Usage

case http_client
in address: 'localhost', port: 3000, use_ssl?: false
  'local development'
in use_ssl?: true, port: 443
  'secure production'
in started?: true
  'active connection'
end

Implementation

• Added PATTERN_MATCHING_KEYS constant defining valid keys: address, port, use_ssl?, started?, read_timeout, write_timeout, open_timeout
• Implemented deconstruct_keys following Ruby pattern matching best practices
• Returns only requested keys when specified, all valid keys when keys is nil
• Tests wrapped in instance_eval with SyntaxError rescue for Ruby 2.6 compatibility