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>

features/messages/impl/build.gradle.kts

@@ -45,6 +45,7 @@ dependencies {
     implementation(projects.libraries.uiStrings)
     implementation(projects.libraries.dateformatter.api)
     implementation(projects.libraries.eventformatter.api)
+    implementation(projects.libraries.htmlrenderer.api)
     implementation(projects.libraries.mediapickers.api)
     implementation(projects.libraries.mediaviewer.api)
     implementation(projects.libraries.featureflag.api)
@@ -111,4 +112,5 @@ dependencies {
     testImplementation(projects.libraries.emoji.impl)
     testImplementation(projects.libraries.emoji.test)
     testImplementation(projects.libraries.slashcommands.test)
+    testImplementation(projects.libraries.htmlrenderer.test)
 }