refactor(PDFBurner): rename Annotation.internalType to fieldName for clarity

EnvelopeGenerator.CommonServices/Jobs/FinalizeDocument/PDFBurner.vb

@@ -206,7 +206,7 @@ Namespace Jobs.FinalizeDocument
 
             Public index As Integer = Nothing
 
-            Public internalType As String = Nothing
+            Public fieldName As String = Nothing
 
             Public hasStructuredID As Boolean = False
 
@@ -240,18 +240,24 @@ Namespace Jobs.FinalizeDocument
                         Throw New BurnAnnotationException($"The index of annotation is not integer. Id: {_id}")
                     End If
 
-                    internalType = parts(3)
+                    fieldName = parts(3)
 
                     hasStructuredID = True
                 End Set
             End Property
 
             Public Property bbox As List(Of Double)
+
             Public Property type As String
+
             Public Property isSignature As Boolean
+
             Public Property imageAttachmentId As String
+
             Public Property lines As Lines
+
             Public Property pageIndex As Integer
+
             Public Property strokeColor As String
         End Class