Add implementation for typeless DataReader

[Richard-AAA]

Right now there's only an interface IDataBinder, but no class implementing it. Or better said: no class only implementing IDataBinder without also implementing IDataBinder<T>.

It seems that a lot of code inside CompiledDataBinder<T> could be modified to also bind data to an object of which we which we supply its Type.
I'd propose a class CompiledDataBinder, with a constructor like

CompiledDataBinder(
  DataBinderOptions opts,
  ReadOnlyCollection<DbColumn> physicalSchema,
  Type recordType)
  {
    // ...
  }

Why, you might ask? Since Sylvan.Data can also be used by Sylvan.Excel, I am interested in parsing multiple sheets into one object. That is, an object containing multiple lists, each list corresponding to one sheet. Given this functionality I can create a parsing strategy, something like this:

var tObject = new T();
do
{
    var sheetName = edr.WorksheetName;
    var type = MatchSheetNameWithType(sheetName);
    if (type is null)
    {
        break; // Go to next sheet
    }
    var itemlist = new List<object>();
    var binder = DataBinder.Create(edr, dataBinderOptions, type);
    while (edr.Read())
    {
        var item = CreateInstanceOfType(type);
        binder.Bind(edr, item);
        itemList.Add(item);
    }
    AssignList(tObject, sheetName, itemList);
} while (edr.NextResult()); // NextResult goes to next sheet

I am willing to create a PR for this if you are also interested in this idea. If you know an easier way to achieve my goals, also please let me know 😄