SelectBuilder where_by for any type non-indexed

[the2pizza]

Add where_by for select builder; works with any column Accepts Fn
Moved where_by to range_by (works with number columns)

Example:

let all = table
        .select_all()
        .range_by(0..10, "test")
        .where_by(|row| row.exchange.contains("Test")
        .where_by(|row| row.exchange.eq("Test")
        .where_by(|row| row.test >= 100)
        .execute()
        .expect("rows");

Works as well for select_by_filed()