Use a raw key for the SDK stores for new sessions (#6835)

* Use a raw key for the SDK stores for new sessions

- Add `ClientSecret` to tell apart the legacy passphrases from the raw keys and centralise parsing/formatting.
- Use the `ClientSecret` to set the passphrase/key in the `SqliteStoreBuilder`.

services/analytics/impl/src/main/kotlin/io/element/android/services/analytics/impl/watchers/DefaultAnalyticsColdStartWatcher.kt

@@ -56,8 +56,9 @@ class DefaultAnalyticsColdStartWatcher(
 
     override fun onRoomListVisible() {
         if (isColdStart.getAndSet(false)) {
-            Timber.d("Room list is visible, finishing cold start check")
-            analyticsService.finishLongRunningTransaction(AnalyticsLongRunningTransaction.ColdStart)
+            analyticsService.finishLongRunningTransaction(AnalyticsLongRunningTransaction.ColdStart) {
+                Timber.d("Room list is visible, finishing cold start check. Elapsed: ${it.duration}")
+            }
         }
     }
 }