piros/tor: Code added to Tor to support PIR-based onion service descriptor lookups @ 0324d3b0ec6d8ee0ec24c2e93915c9aa70e1665d

Roger Dingledine 0324d3b0ec fetch relay descriptors from v3 authorities		16 lat temu
..
1324-fetch-from-v3-not-v2	0324d3b0ec fetch relay descriptors from v3 authorities	16 lat temu