feat: Add not_found to guild member chunk data (#8975)

* feat: add `not_found` to chunk data

* docs: consistency

* types: export `JSONValue`

* refactor: move into typedef area

* refactor: prefer unknown

* docs: fix parsing

Co-authored-by: kodiakhq[bot] <49736102+kodiakhq[bot]@users.noreply.github.com>

packages/discord.js/src/client/websocket/handlers/GUILD_MEMBERS_CHUNK.js

@@ -18,6 +18,8 @@ module.exports = (client, { d: data }) => {
    * @typedef {Object} GuildMembersChunk
    * @property {number} index Index of the received chunk
    * @property {number} count Number of chunks the client should receive
+   * @property {Array<*>} notFound An array of whatever could not be found
+   * when using {@link GatewayOpcodes.RequestGuildMembers}
    * @property {?string} nonce Nonce for this chunk
    */
 
@@ -29,8 +31,9 @@ module.exports = (client, { d: data }) => {
    * @param {GuildMembersChunk} chunk Properties of the received chunk
    */
   client.emit(Events.GuildMembersChunk, members, guild, {
-    count: data.chunk_count,
     index: data.chunk_index,
+    count: data.chunk_count,
+    notFound: data.not_found,
     nonce: data.nonce,
   });
 };