feat(pdfburner): add ink annotation support and refactor annotation handling

- Added new AddInkAnnotation(page As Integer, value As String) method to handle ink annotations from element data.
- Introduced new Ink model class for deserializing ink annotation data (lines and strokeColor).
- Updated BurnElementAnnotsToPDF to support Ink annotation type.
- Refactored annotation type handling for better extensibility.
- Improved annotation burning logic for mixed annotation types (form fields, images, inks).

EnvelopeGenerator.CommonServices/Jobs/FinalizeDocument/PDFBurner.vb

@@ -64,6 +64,8 @@ Namespace Jobs.FinalizeDocument
                         AddFormFieldValue(annot.Name, x, y, 100, 180, element.Page, annot.Value)
                     ElseIf annot.Type = AnnotationType.FormField Then
                         AddImageAnnotation(x, y, 100, 180, element.Page, annot.Value)
+                    ElseIf annot.Type = AnnotationType.Ink Then
+                        AddInkAnnotation(element.Page, annot.Value)
                     End If
                 Next
             Next
@@ -158,6 +160,23 @@ Namespace Jobs.FinalizeDocument
             Manager.AddEmbeddedImageAnnotFromBase64(oAttachment.Value.binary, oX, oY, oWidth, oHeight)
         End Sub
 
+        Private Sub AddInkAnnotation(page As Integer, value As String)
+
+            Dim ink = JsonConvert.DeserializeObject(Of Ink)(value)
+
+            Dim oSegments = ink.lines.points
+            Dim oColor = ColorTranslator.FromHtml(ink.strokeColor)
+            Manager.SelectPage(page + 1)
+
+            For Each oSegment As List(Of List(Of Single)) In oSegments
+                Dim oPoints = oSegment.
+                Select(AddressOf ToPointF).
+                ToArray()
+
+                Manager.AddFreeHandAnnot(oColor, oPoints)
+            Next
+        End Sub
+
         Private Sub AddInkAnnotation(pAnnotation As Annotation)
             Dim oSegments = pAnnotation.lines.points
             Dim oColor = ColorTranslator.FromHtml(pAnnotation.strokeColor)
@@ -339,6 +358,12 @@ Namespace Jobs.FinalizeDocument
             Public Property strokeColor As String
         End Class
 
+        Friend Class Ink
+            Public Property lines As Lines
+
+            Public Property strokeColor As String
+        End Class
+
         Public Class EGName
             Public Shared ReadOnly NoName As String = Guid.NewGuid().ToString()