sql: Add PreparedStatements.DeleteAll method
sql: Add PreparedStatements.DeleteAll method

This change also returns deletion statuses from
- `PreparedStatements.Delete`
- `PreparedPortals.Delete`

cockroachdb/cockroach,sunya123/cockroach,vivekmenezes/cockroach,cockroachdb/cockroach,vaibhavarora/cockroach,petermattis/cockroach,veteranlu/cockroach,petermattis/cockroach,petermattis/cockroach,glycerine/cockroach,sunya123/cockroach,arjun4084346/cockroach,paperstreet/cockroach,glycerine/cockroach,petermattis/cockroach,glycerine/cockroach,veteranlu/cockroach,vivekmenezes/cockroach,paperstreet/cockroach,veteranlu/cockroach,sunya123/cockroach,vivekmenezes/cockroach,vaibhavarora/cockroach,cockroachdb/cockroach,paperstreet/cockroach,paperstreet/cockroach,veteranlu/cockroach,arjun4084346/cockroach,arjun4084346/cockroach,maxlang/cockroach,maxlang/cockroach,maxlang/cockroach,vaibhavarora/cockroach,veteranlu/cockroach,arjun4084346/cockroach,vaibhavarora/cockroach,glycerine/cockroach,vaibhavarora/cockroach,cockroachdb/cockroach,vaibhavarora/cockroach,maxlang/cockroach,cockroachdb/cockroach,paperstreet/cockroach,cockroachdb/cockroach,vivekmenezes/cockroach,maxlang/cockroach,petermattis/cockroach,veteranlu/cockroach,veteranlu/cockroach,petermattis/cockroach,sunya123/cockroach,cockroachdb/cockroach,cockroachdb/cockroach,sunya123/cockroach,maxlang/cockroach,vivekmenezes/cockroach,glycerine/cockroach,paperstreet/cockroach,paperstreet/cockroach,petermattis/cockroach,maxlang/cockroach,sunya123/cockroach,maxlang/cockroach,vivekmenezes/cockroach,petermattis/cockroach,veteranlu/cockroach,arjun4084346/cockroach,arjun4084346/cockroach,sunya123/cockroach,vivekmenezes/cockroach,vivekmenezes/cockroach,sunya123/cockroach,vaibhavarora/cockroach,arjun4084346/cockroach,vaibhavarora/cockroach,glycerine/cockroach,arjun4084346/cockroach,paperstreet/cockroach,glycerine/cockroach,glycerine/cockroach