[tor-relays] Introducing new bridge status page

[Philipp Winter]

As part of our ongoing effort to reimplement BridgeDB, we now have a
bridge status page that shows if a bridge's pluggable transports work:

  https://bridges.torproject.org/status?id=FINGERPRINT

FINGERPRINT is your bridge's fingerprint or its hashed fingerprint --
either works.

The backend tests bridges every 18 hours by making a tor process fetch
the bridge's descriptor.  Tor bridges will soon log a URL pointing to
this status page:
https://gitlab.torproject.org/tpo/core/tor/-/issues/30477

As of today, 89% of all pluggable transports work.

Cheers,
Philipp