Merge bitcoin/bitcoin#26118: log: Use steady clock for bench logging

fabf1cdb20 Use steady clock for bench logging (MacroFake)
faed342a23 scripted-diff: Rename time symbols (MacroFake)

Pull request description:

  Instead of using `0.001` and similar constants to "convert" an int64_t to milliseconds, use the type-safe `Ticks<>` helper. Also, use steady clock instead of system clock, since the durations are used for benchmarking.

ACKs for top commit:
  fanquake:
    ACK fabf1cdb20 - validation bench output still looks sane.

Tree-SHA512: e6525b5fdad6045ca500c56014897d7428ad288aaf375933d3b5939feddf257f6910d562eb66ebcde9186bef9a604ee8d763a318253838318d59df2a285be7c2

src/util/time.h

@@ -57,6 +57,7 @@ constexpr int64_t count_microseconds(std::chrono::microseconds t) { return t.cou
 
 using HoursDouble = std::chrono::duration<double, std::chrono::hours::period>;
 using SecondsDouble = std::chrono::duration<double, std::chrono::seconds::period>;
+using MillisecondsDouble = std::chrono::duration<double, std::chrono::milliseconds::period>;
 
 /**
  * DEPRECATED