Adapt to new DM definition changes in the SDK (#6748)

* Set `DmRoomDefinition.TwoPeople` in `ClientBuilder`. This applies the 'direct and with at most 2 non-service members' rule to what the SDK should consider a DM.

* Map `RoomInfo.isDm` from the SDK

* Map `NotificationData.isDm` from `NotificationInfo.roomInfo.isDm`

* Remove `RoomIsDmCheck` file as its extension functions are now redundant. Move `Room.isDm` helper function to `BaseRoom`.

* Map `isDm` in `SpaceRoom` from the SDK too

* Replace `isDirect` with `isDm` where possible

* Map `RoomMember.isServiceMember` from the SDK and use it to tell apart normal members of a room from service members (i.e. `RoomMembersState.getDirectRoomMember`)

libraries/previewutils/src/main/kotlin/io/element/android/libraries/previewutils/room/RoomMemberFixture.kt

@@ -33,6 +33,7 @@ fun aRoomMember(
     isIgnored: Boolean = false,
     role: RoomMember.Role = RoomMember.Role.User,
     membershipChangeReason: String? = null,
+    isServiceMember: Boolean = false,
 ) = RoomMember(
     userId = userId,
     displayName = displayName,
@@ -43,6 +44,7 @@ fun aRoomMember(
     isIgnored = isIgnored,
     role = role,
     membershipChangeReason = membershipChangeReason,
+    isServiceMember = isServiceMember,
 )
 
 fun aRoomMemberList() = persistentListOf(

libraries/previewutils/src/main/kotlin/io/element/android/libraries/previewutils/room/SpaceRoomFixture.kt

@@ -34,6 +34,7 @@ fun aSpaceRoom(
     topic: String? = null,
     worldReadable: Boolean = false,
     isDirect: Boolean? = null,
+    isDm: Boolean? = null,
     via: List<String> = emptyList(),
 ) = SpaceRoom(
     rawName = rawName,
@@ -51,5 +52,6 @@ fun aSpaceRoom(
     topic = topic,
     worldReadable = worldReadable,
     via = via.toImmutableList(),
-    isDirect = isDirect
+    isDirect = isDirect,
+    isDm = isDm,
 )