Add configuration for sharing emoji packs

This adds the configuration interface for the endpoints introduced here.

src/api/emoji_packs.js

@@ -42,4 +42,15 @@ export async function downloadFrom(host, instance_address, pack_name, as, token)
   })
 }
 
+export async function savePackMetadata(host, token, name, new_data) {
+  return await request({
+    baseURL: baseName(host),
+    url: `/api/pleroma/emoji/packs/update_metadata/${name}`,
+    method: 'post',
+    headers: authHeaders(token),
+    data: { name, new_data },
+    timeout: 0 // This might take a long time
+  })
+}
+
 const authHeaders = (token) => token ? { 'Authorization': `Bearer ${getToken()}` } : {}