support parameterized query in Postgres extended query protocol

We have the basic support for Postgres extended query protocol. However, as there is no SLT syntax available for the individual steps of Parse and Bind, we always query with a full SQL and no parameters.

sqllogictest-rs/sqllogictest-engines/src/postgres/extended.rs

Lines 191 to 195 in 58673cb

    
           let stmt = self.client.prepare(sql).await?; 
        
           let rows = self 
        
               .client 
        
               .query_raw(&stmt, std::iter::empty::<&(dyn ToSql + Sync)>()) 
        
               .await?;

	let stmt = self.client.prepare(sql).await?;
	let rows = self
	.client
	.query_raw(&stmt, std::iter::empty::<&(dyn ToSql + Sync)>())
	.await?;