When logging duration objects we want special formatting to occur:

"duration"_attr = Milliseconds(10)

Should be formatted as:

"durationMillis": 10

Where the attribute name is updated with a unit suffix added and the value should just be the duration count.

It creates an inconsistency we're determined is acceptable:

When logging durations in containers, such as:

std::vector<Milliseconds> vec = {Milliseconds(10), Milliseconds(50)};
"things"_attr = vec

There is no attribute name for each duration that we can update and the duration will instead be logged as an object instead of just a scalar:

things: [{"durationMillis": 10}, {"durationMillis": 50}]