Fix crash about several DataStores using the same file (#2312)

* Fix crash about several DataStores using the same file

- Create `@SessionCoroutineScope` annotation to pass a session-managed coroutine scope to the DI.
- Expose this scope from `MatrixClient`.
- Rework DataStore file creation a bit.
- Centralise session preference creation through `DefaultSessionPreferencesStoreFactory` until we figure out what went wrong with the scoping

app/src/main/kotlin/io/element/android/x/di/SessionComponent.kt

@@ -33,6 +33,7 @@ interface SessionComponent : NodeFactoriesBindings {
     interface Builder {
         @BindsInstance
         fun client(matrixClient: MatrixClient): Builder
+
         fun build(): SessionComponent
     }