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

libraries/di/src/main/kotlin/io/element/android/libraries/di/annotations/SessionCoroutineScope.kt

@@ -0,0 +1,27 @@
+/*
+ * Copyright (c) 2024 New Vector Ltd
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package io.element.android.libraries.di.annotations
+
+import javax.inject.Qualifier
+
+/**
+ * Qualifies a [CoroutineScope] object which represents the base coroutine scope to use for an active session.
+ */
+@Retention(AnnotationRetention.RUNTIME)
+@MustBeDocumented
+@Qualifier
+annotation class SessionCoroutineScope