chore: add more field types (#1141)

Adds a number of new field types and capabilities to existing fields.

A massive change with far too many moving pieces to document in a single commit.

packages/lib/server-only/document/seal-document.ts

@@ -117,6 +117,9 @@ export const sealDocument = async ({
     await insertFieldInPDF(doc, field);
   }
 
+  // Re-flatten post-insertion to handle fields that create arcoFields
+  flattenForm(doc);
+
   const pdfBytes = await doc.save();
 
   const pdfBuffer = await signPdf({ pdf: Buffer.from(pdfBytes) });