DEV: Improve addToolbarPopupMenuOptionsCallback plugin api (#23769)

Why this change?

Previously just using the `addToolbarPopupMenuOptionsCallback` plugin
API itself was insufficient because it required the return object to
include an `action` key which only accepted a name of the action
function as a string. This was highly problematic because the action
function had to be defined on the `composer` service which means using
the `modifyClass` API to add the action function. This made the API
awkward to use leading to poor developer experiencec.

What does this change do?

This commit introduces a couple of improvemnts to the API.

1. First the API has been renamed to `addComposerToolbarPopupMenuOption` because
   the API no longer accepts a callback function which was quite
   redundant. Instead, it now accepts an Object. The
   `addToolbarPopupMenuOptionsCallback` API function is deprecated and
   will be dropped in Discourse 3.3. Note that passing the API a
   function is still supported but will be dropped when the `addToolbarPopupMenuOptionsCallback`
   is removed.

2. The `action` key in the Object passed to the function can now be a
   function and is passed the `toolbarEvent` object when called.

3. The `condition` on key in the Object passed to the function can now be a
   function and is passed the `composer` service when called.

docs/CHANGELOG-JAVASCRIPT-PLUGIN-API.md

@@ -7,6 +7,17 @@ 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).
 
+## [1.14.0] - 2023-10-06
+
+### Added
+
+- Added `addComposerToolbarPopupMenuOption` as a replacement for `addToolbarPopupMenuOptionsCallback` with new changes
+  introduced to the method's signature.
+
+### Changed
+
+- Deprecate `addToolbarPopupMenuOptionsCallback` in favor of `addComposerToolbarPopupMenuOption`.
+
 ## [1.13.0] - 2023-10-05
 
 ### Added