Fix printing of `time` case results to match documentation

[mpoelsterl1217]

The results of time cases will now be printed with just timing information as documented.

Previously, the struct bundling the time case label, timing information, and result was printed naively.

[stamourv]

I like that. Did you test the lecture 6 benchmarks to make sure they still work? And can you work with Tochukwu to make sure the homework 3, 4, and project stress tests still work? Once you confirm that all of this works, please squash the commits into one then I'll merge. Thanks!

[stamourv]

FWIW, I confirmed on the grading side; that would have been complicated to set up. I'll let you do the benchmarks.

[mpoelsterl1217]

I confirmed the lecture 6 benchmarks still work. time still returns the timing struct as that code expects (it is a little weird that this "statement" form produces a result). The change here changes how that struct gets printed.

[stamourv]

Thanks! Merged.