Refactor: Move InMemorySessionStore to test module

- Delete `libraries/session-storage/impl-memory` module
- Move `InMemorySessionStore.kt` to `libraries/session-storage/test`

libraries/session-storage/test/src/main/kotlin/io/element/android/libraries/sessionstorage/test/InMemorySessionStore.kt

@@ -0,0 +1,71 @@
+/*
+ * Copyright 2023, 2024 New Vector Ltd.
+ *
+ * SPDX-License-Identifier: AGPL-3.0-only OR LicenseRef-Element-Commercial
+ * Please see LICENSE files in the repository root for full details.
+ */
+
+package io.element.android.libraries.sessionstorage.test
+
+import io.element.android.libraries.sessionstorage.api.LoggedInState
+import io.element.android.libraries.sessionstorage.api.SessionData
+import io.element.android.libraries.sessionstorage.api.SessionStore
+import kotlinx.coroutines.flow.Flow
+import kotlinx.coroutines.flow.MutableStateFlow
+import kotlinx.coroutines.flow.asStateFlow
+import kotlinx.coroutines.flow.map
+
+class InMemorySessionStore : SessionStore {
+    private val sessionDataListFlow = MutableStateFlow<List<SessionData>>(emptyList())
+
+    override fun isLoggedIn(): Flow<LoggedInState> {
+        return sessionDataListFlow.map {
+            if (it.isEmpty()) {
+                LoggedInState.NotLoggedIn
+            } else {
+                it.first().let { sessionData ->
+                    LoggedInState.LoggedIn(
+                        sessionId = sessionData.userId,
+                        isTokenValid = sessionData.isTokenValid,
+                    )
+                }
+            }
+        }
+    }
+
+    override fun sessionsFlow(): Flow<List<SessionData>> = sessionDataListFlow.asStateFlow()
+
+    override suspend fun storeData(sessionData: SessionData) {
+        val currentList = sessionDataListFlow.value.toMutableList()
+        currentList.removeAll { it.userId == sessionData.userId }
+        currentList.add(sessionData)
+        sessionDataListFlow.value = currentList
+    }
+
+    override suspend fun updateData(sessionData: SessionData) {
+        val currentList = sessionDataListFlow.value.toMutableList()
+        val index = currentList.indexOfFirst { it.userId == sessionData.userId }
+        if (index != -1) {
+            currentList[index] = sessionData
+            sessionDataListFlow.value = currentList
+        }
+    }
+
+    override suspend fun getSession(sessionId: String): SessionData? {
+        return sessionDataListFlow.value.first { it.userId == sessionId }
+    }
+
+    override suspend fun getAllSessions(): List<SessionData> {
+        return sessionDataListFlow.value
+    }
+
+    override suspend fun getLatestSession(): SessionData? {
+        return sessionDataListFlow.value.firstOrNull()
+    }
+
+    override suspend fun removeSession(sessionId: String) {
+        val currentList = sessionDataListFlow.value.toMutableList()
+        currentList.removeAll { it.userId == sessionId }
+        sessionDataListFlow.value = currentList
+    }
+}