Function parse_structured_query 

pub fn parse_structured_query(
    query: &str,
) -> Result<Vec<(String, String)>, QueryBuilderError>

Parse structured query strings like “key:value key2:value1,value2” Used for complex filtering patterns in APIs like Foxglove

Supported patterns:

• Simple: “status:active”
• Multiple values: “type:sensor,camera”
• Quoted values: “location:"New York"”
• Complex: “status:active type:sensor location:"San Francisco"”