Create a PdfPage builder

[victor-pogor]

Context

In order to use low-level objects from the Core library, there is a requirement to build a PdfPage class that will help to generate a PDF document at a high level.

This object should implement the builder pattern and support the FluentAPI and the Delegate as a constructor parameter in order to configure the PDF document

Sample Design

var pdfDocument = new PdfDocumentBuilder()
  .AddPage() // Use the builder pattern to add the page properties
     .WithFontFamily("Arial")
     .WithFontSize(14)
     .WithContent("Hello, world!")
  .BuildPage()
  .AddPage(options => option.Content = "This is the second page." ) // Configure using the delegate as a param
.BuildPdfDocument();

Acceptance criteria

1. Implement the PdfPage object
2. The code must be covered with the unit and benchmark tests