DEV: Add more-topics plugin API (#29143)

From plugin-api comment:

Registers a new tab to be displayed in "more topics" area at the bottom of a topic page.

```gjs
 api.registerMoreTopicsTab({
   id: "other-topics",
   name: i18n("other_topics.tab"),
   component: <template>tbd</template>,
   condition: ({ topic }) => topic.otherTopics?.length > 0,
 });
```

You can additionally use more-topics-tabs value transformer to conditionally show/hide
specific tabs.

```js
api.registerValueTransformer("more-topics-tabs", ({ value, context }) => {
  if (context.user?.aFeatureFlag) {
    // Remove "suggested" from the topics page
    return value.filter(
      (tab) =>
        context.currentContext !== "topic" ||
        tab.id !== "suggested-topics"
    );
  }
});
```

docs/CHANGELOG-JAVASCRIPT-PLUGIN-API.md

@@ -7,11 +7,14 @@ in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+## [1.38.0] - 2024-10-30
+
+- Added `registerMoreTopicsTab` and "more-topics-tabs" value transformer that allows to add or remove new tabs to the "more topics" (suggested/related) area.
+
 ## [1.37.3] - 2024-10-24
 
 - Added `disableDefaultKeyboardShortcuts` which allows plugins/TCs to disable default keyboard shortcuts.
 
-
 ## [1.37.2] - 2024-10-02
 
 - Fixed comments and text references to Font Awesome 5 in favor of the more generic Font Awesome due to core now having the latest version and no longer needing to specify version 5.
@@ -26,7 +29,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [1.36.0] - 2024-08-06
 
-- Added `addLogSearchLinkClickedCallbacks` which allows plugins/TCs to register a callback when a search link is clicked and before a search log is created 
+- Added `addLogSearchLinkClickedCallbacks` which allows plugins/TCs to register a callback when a search link is clicked and before a search log is created
 
 ## [1.35.0] - 2024-07-30