Postgres prepared statements aren't captured in audit log

[r0mant]

Current database access protocol integration captures simple pgproto3.Query messages but doesn't take into account prepared statements so those slip the audit log.

Example logs when using DataGrip that executes prepared statements:

DEBU [DB:SERVIC] Received client message: &pgproto3.Parse{Name:"S_3", Query:"select * from test", ParameterOIDs:[]uint32(nil)}. db:local from:client id:7714d409-e373-4bf4-9a43-31dd093b440a postgres/engine.go:265
DEBU [DB:SERVIC] Received client message: &pgproto3.Bind{DestinationPortal:"C_4", PreparedStatement:"S_3", ParameterFormatCodes:[]int16(nil), Parameters:[][]uint8(nil), ResultFormatCodes:[]int16{}}. db:local from:client id:7714d409-e373-4bf4-9a43-31dd093b440a postgres/engine.go:265
DEBU [DB:SERVIC] Received client message: &pgproto3.Describe{ObjectType:0x50, Name:"C_4"}. db:local from:client id:7714d409-e373-4bf4-9a43-31dd093b440a postgres/engine.go:265
DEBU [DB:SERVIC] Received client message: &pgproto3.Execute{Portal:"C_4", MaxRows:0x64}. db:local from:client id:7714d409-e373-4bf4-9a43-31dd093b440a postgres/engine.go:265
DEBU [DB:SERVIC] Received client message: &pgproto3.Sync{}. db:local from:client id:7714d409-e373-4bf4-9a43-31dd093b440a postgres/engine.go:265
DEBU [DB:SERVIC] Received server message: &pgproto3.ParseComplete{}. db:local from:server id:7714d409-e373-4bf4-9a43-31dd093b440a postgres/engine.go:303
DEBU [DB:SERVIC] Received server message: &pgproto3.BindComplete{}. db:local from:server id:7714d409-e373-4bf4-9a43-31dd093b440a postgres/engine.go:303
DEBU [DB:SERVIC] Received server message: &pgproto3.RowDescription{Fields:[]pgproto3.FieldDescription{pgproto3.FieldDescription{Name:[]uint8{0x69, 0x64}, TableOID:0x6001, TableAttributeNumber:0x1, DataTypeOID:0x19, DataTypeSize:-1, TypeModifier:-1, Format:0}}}. db:local from:server id:7714d409-e373-4bf4-9a43-31dd093b440a postgres/engine.go:303
DEBU [DB:SERVIC] Received server message: &pgproto3.DataRow{Values:[][]uint8{[]uint8{0x71, 0x77, 0x65, 0x71, 0x77, 0x65, 0x71, 0x77, 0x65}}}. db:local from:server id:7714d409-e373-4bf4-9a43-31dd093b440a postgres/engine.go:303
...

We need to capture pgproto3.Parse messages as well.