Add KDoc to the authentication, logout, preferences and share API interfaces

Cover the remaining interfaces of features/login, features/logout,
features/preferences and features/share, along with their members and parameters.

Points recorded here: AccountProviderAccessControl returns true on a build with no
enterprise restriction, ExtraDeveloperOptionsRenderer is bound to a no-op in the
standard build, DirectLogoutView draws nothing until a logout event is sent, and
CacheService exists because clearing a cache destroys the client and the app has
to react.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

features/logout/api/src/main/kotlin/io/element/android/features/logout/api/direct/DirectLogoutView.kt

@@ -10,7 +10,17 @@ package io.element.android.features.logout.api.direct
 
 import androidx.compose.runtime.Composable
 
+/**
+ * Renders the confirmation dialogs of logging out directly, in particular the warning shown when the user would lose their room keys.
+ *
+ * It draws nothing until the host screen sends a logout event.
+ */
 fun interface DirectLogoutView {
+    /**
+     * Draws whichever dialog the current state calls for.
+     *
+     * @param state the state produced by the direct logout presenter.
+     */
     @Composable
     fun Render(state: DirectLogoutState)
 }