Upgrade TDataProxyFactory registration and usage

[bogdanpolak]

New factory structure:

TDataProxyFactory = class
public
  class procedure RegisterDataSet(AProxyClass: TDataProxyClass; 
    const AConfigurationName: string; ADataSetCreateFun: TFun<TDataSet>); 
  class procedure SetDatasetConfiguration (AProxyClass: TDataProxyClass; 
    const AConfigurationName: string);
  class function CreateProxy (AProxyClass: TDataProxyClass; 
    AOwner: TComponent);
end;

Registration sample

TDataProxyFactory.RegisterDataSet(TBookProxy, 'FireDAC-dsBook', 
  function (): TDataSet;
  begin
    Result := TFDQuery.Create(AOwner);
    (Result as TFDQuery).Connection := FDConnection1;
    (Result as TFDQuery).SQL.Texr := 'SELECT ISBN, Title, Authors, ' +
      'Status, ReleseDate, Pages, Price, Currency, Imported, Description '+
      'FROM Books WHERE ReleaseDate > :ReleaseDate';
  end);
TDataProxyFactory.RegisterDataSet(TBookProxy, 'Mem-dsBook', CreateMockTableBook);

Configuration sample

TDataProxyFactory.SetDatasetConfiguration (TBookProxy, 'Mem-dsBook');

Usage sample

BookProxy := TDataProxyFactory.CreateProxy<TBookProxy>(AOwner)
BookProxy.Open ([EncodeDate(2018,01,01)],[ftDateTime])

[bogdanpolak]

Closed because of: Incorrect architectural assumptions.