Add benchmarks for all internal setup ceremony items

[cronokirby]

Closes #2877.

(also tweaks the API to make more things available, which I had forgotten).

Here's some benchmarks on my laptop (AMD Ryzen 7 6800HS):

Running benches/all.rs (/home/lucas/Work/Penumbra/Penumbra/target/release/deps/all-2e3abdec058d17d3)
Gnuplot not found, using plotters backend
Benchmarking phase 1: Warming up for 3.0000 s
Warning: Unable to complete 10 samples in 5.0s. You may wish to increase target time to 843.0s.
phase 1                 time:   [83.327 s 83.960 s 84.580 s]

Benchmarking phase 1 check: Warming up for 3.0000 s
Warning: Unable to complete 10 samples in 5.0s. You may wish to increase target time to 1562.9s.
phase 1 check           time:   [155.04 s 155.54 s 156.03 s]

Benchmarking phase transition: Warming up for 3.0000 s
Warning: Unable to complete 10 samples in 5.0s. You may wish to increase target time to 1476.2s.
phase transition        time:   [147.02 s 147.27 s 147.54 s]

Benchmarking phase 2: Warming up for 3.0000 s
Warning: Unable to complete 10 samples in 5.0s. You may wish to increase target time to 167.9s.
phase 2                 time:   [15.763 s 15.984 s 16.209 s]

phase 2 check           time:   [273.82 ms 276.81 ms 280.27 ms]

Might be a good idea to have someone with the same computer model as was used to run the other benchmarks to run these to have consistent numbers. (Maybe having a machine for running benchmarks might be a good idea?, dunno)