feat: use server-actions for authoring flow

This change actually makes the authoring flow work for
the most part by tying in emailing and more.

We have also done a number of quality of life updates to
simplify the codebase overall making it easier to continue
work on the refresh.

apps/web/src/components/forms/edit-document/add-signers.action.ts

@@ -0,0 +1,26 @@
+'use server';
+
+import { getRequiredServerComponentSession } from '@documenso/lib/next-auth/get-server-session';
+import { setRecipientsForDocument } from '@documenso/lib/server-only/recipient/set-recipients-for-document';
+
+import { TAddSignersFormSchema } from './add-signers.types';
+
+export type AddSignersActionInput = TAddSignersFormSchema & {
+  documentId: number;
+};
+
+export const addSigners = async ({ documentId, signers }: AddSignersActionInput) => {
+  'use server';
+
+  const { id: userId } = await getRequiredServerComponentSession();
+
+  await setRecipientsForDocument({
+    userId,
+    documentId,
+    recipients: signers.map((signer) => ({
+      id: signer.nativeId,
+      email: signer.email,
+      name: signer.name,
+    })),
+  });
+};