First implementation of using Node/Presenter/UI on RoomList (no DI)

libraries/core/src/main/java/io/element/android/x/core/architecture/Presenter.kt

@@ -0,0 +1,9 @@
+package io.element.android.x.core.architecture
+
+import androidx.compose.runtime.Composable
+import kotlinx.coroutines.flow.Flow
+
+interface Presenter<State, Event> {
+    @Composable
+    fun present(events: Flow<Event>): State
+}