feat(annotations): add mapSignature function for mapping form field data

- Introduced new function `mapSignature(iJSON)` to process formFieldValues
- Filters out label fields and maps form field data to include elementId and simplified name
- Enhances annotation handling for signature mapping

EnvelopeGenerator.Web/wwwroot/js/annotation.js

@@ -307,4 +307,15 @@ function markFieldAsCity(formField) {
 
 function isCityField(formField) {
     return cityFieldNames.includes(formField.name)
+}
+
+function mapSignature(iJSON) {
+    return {
+        formFields: iJSON.formFieldValues.filter(field => !field.name.includes("label")).map((field) => {
+            const nameParts = field.name.split('#');
+            field.elementId = Number(nameParts[2]);
+            field.name = nameParts[3];
+            return field;
+        })
+    };
 }