Make a selected column from a leftJoined table option with `Some`

[JordanMarr]

Should be able to make a selected column from a leftJoined table optional by wrapping it with Some.

For example:

    let! results = 
        selectTask HydraReader.Read (Create openContext)  {
            for o in Sales.SalesOrderHeader do
            leftJoin sr in Sales.SalesOrderHeaderSalesReason on (o.SalesOrderID = sr.Value.SalesOrderID)
            leftJoin r in Sales.SalesReason on (sr.Value.SalesReasonID = r.Value.SalesReasonID)
            where (isNullValue r.Value.Name)
            select (o.SalesOrderID, Some r.Value.ReasonType, Some r.Value.Name)
            take 10
        }

In the example above, the SalesReason table is optional because it is left joined. We should be able to wrap these individually selected columns with Some so that they are of option types.

Currently, v2.2.0 where expression parser fails when wrapping selected columns with Some.