Add Maestro tests for create & join rooms (#472)

I created 2 additional test users to use them as MXID we lookup during room creation.

I.e. we will not login as those users, it's just 2 known MXIDs that we know exist so we can look them up.

- https://github.com/vector-im/element-x-android/issues/409

.maestro/tests/roomList/createAndDeleteDM.yaml

@@ -0,0 +1,13 @@
+appId: ${APP_ID}
+---
+# Purpose: Test the creation and deletion of a DM room.
+- tapOn: "Create a new conversation or room"
+- tapOn: "Search for someone"
+- inputText: ${INVITEE1_MXID}
+- tapOn:
+    text: ${INVITEE1_MXID}
+    index: 1
+- takeScreenshot: build/maestro/330-createAndDeleteDM
+- tapOn: "maestroelement2"
+- tapOn: "Leave room"
+- tapOn: "Leave"