auto route polish

[shunjizhan]

Change

• added request params and other info to routeStatus for potential debugging convenience
• added optional timeout param to /routeStatus, to be more flexible
• added optional destAddr param to /routeStatus, so if user closes page and come back, UI can query user's recent route requests, and resume progress page (this is for frontend UX only, routing will continue in backend anyways)
• optimized tracker cleanup. It's not a good practice to have too many timeouts pending for 1 week, instead we can check tracker size, and do the cleanup when it reaches size limit
• moved route homa tests to it's only file

Test

tested locally, auto routing still works, and new param also works