Render Room and Message Pills (#3809)

* added a way to render the room and the message

pills, but is WIP

* permalinks now get converted into pills!

* fixed an issue where room address mentions

were not adding a URL properly but a string

* updated tests

* c

* Revert "c"

This reverts commit 5c80252fa23dba7e4d44f2a07fbf1e9500e37c82.

* updated tests

* more tests

* created APIs to get a specific RoomSummary

given the id or the alias

* small mention builder improvement

* pr suggestions

UnitTests/Sources/RoomSummaryTests.swift

@@ -68,6 +68,7 @@ class RoomSummaryTests: XCTestCase {
                     unreadNotificationsCount: 0,
                     notificationMode: nil,
                     canonicalAlias: nil,
+                    alternativeAliases: [],
                     hasOngoingCall: false,
                     isMarkedUnread: false,
                     isFavourite: false)