feat: add field and recipient endpoints

packages/lib/server-only/field/get-field-by-id.ts

@@ -0,0 +1,17 @@
+import { prisma } from '@documenso/prisma';
+
+export type GetFieldByIdOptions = {
+  fieldId: number;
+  documentId: number;
+};
+
+export const getFieldById = async ({ fieldId, documentId }: GetFieldByIdOptions) => {
+  const field = await prisma.field.findFirst({
+    where: {
+      id: fieldId,
+      documentId,
+    },
+  });
+
+  return field;
+};