Integrate the new timeline renderer behind a feature flag (#7722)

* Integrate the new renderer with the timeline UI

* Composable functions are now in `:libraries:htmlrenderer:api` so we don't need to add `impl` to other modules.

* Improve inline code span

* Return both the text and URL in `onLinkClick` and `onLinkLongClick` so we can check the URL is not misleading

* Remove `SelectionContainer` for now - it creates issues when long pressing

* Make `LocalComposeTimelineEventRenderer` contain a `ComposeLocalTimelineEventRendererData` instance. This checks if the new rendering is enabled and what is the current user id so it can be used for styling mention pills

* Add fading edges to code block to indicate scrolling is possible

* Long pressing in a code block copies its contents to the clipboard

* Fix alignment of ordered list item prefixes

* Don't use default values in State data classes

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Co-authored-by: ElementBot <android@element.io>

libraries/ui-strings/src/main/res/values/localazy.xml

@@ -108,6 +108,7 @@
   <string name="action_copy_link">"Copy link"</string>
   <string name="action_copy_link_to_message">"Copy link to message"</string>
   <string name="action_copy_text">"Copy text"</string>
+  <string name="action_copy_to_clipboard">"Copy to clipboard"</string>
   <string name="action_create">"Create"</string>
   <string name="action_create_room">"Create room"</string>
   <string name="action_create_space">"Create space"</string>
@@ -240,6 +241,7 @@
   <string name="common_call_started">"Call started"</string>
   <string name="common_call_you_declined">"You declined a call"</string>
   <string name="common_chat_backup">"Chat backup"</string>
+  <string name="common_code_block">"Code block"</string>
   <string name="common_copied_to_clipboard">"Copied to clipboard"</string>
   <string name="common_copyright">"Copyright"</string>
   <string name="common_creating_room">"Creating room…"</string>