Benchmarks related to Share Refresh

[theref]

Finishes #24

[theref]

Getting the error:

error: unused `ark_ec::short_weierstrass_jacobian::GroupProjective` that must be used
   --> tpke/benches/tpke.rs:327:21
    |
327 | /                     black_box(recover_share_at_point::<E>(
328 | |                         &remaining_participants[..shares_num],
[329](https://github.com/nucypher/ferveo/actions/runs/3968438305/jobs/6801725125#step:5:330) | |                         threshold,
[330](https://github.com/nucypher/ferveo/actions/runs/3968438305/jobs/6801725125#step:5:331) | |                         &x_r,
331 | |                         &mut rng,
332 | |                     ));
    | |______________________^
    |
    = note: `-D unused-must-use` implied by `-D warnings`
    ```
    but the type that is specifies isn't used in the code

[piotr-roslaniec]

Any reason why you've selected bench_with_input over bench_function? Did you have any issues with ownership? Just curious because closures always worked fine for me.

[piotr-roslaniec]

I think you don't need to use bench_with_input here: Notice that shares_num passed in as a second argument is unused: |b, _|

Suggested change

	group.bench_with_input(
	BenchmarkId::new("Recover Share at Point", shares_num),
	&shares_num,
	|b, _| {
	let mut rng = rand::rngs::StdRng::seed_from_u64(0);
	b.iter(|| {
	let _ = black_box(recover_share_at_point::<E>(
	&remaining_participants[..shares_num],
	threshold,
	&x_r,
	&mut rng,
	));
	});
	},
	);
	group.bench_function(
	BenchmarkId::new("Recover Share at Point", shares_num),
	|b| {
	let mut rng = rand::rngs::StdRng::seed_from_u64(0);
	b.iter(|| {
	let _ = black_box(recover_share_at_point::<E>(
	&remaining_participants[..shares_num],
	threshold,
	&x_r,
	&mut rng,
	));
	});
	},
	);

[piotr-roslaniec]

Similarly here:

Suggested change

	group.bench_with_input(
	BenchmarkId::new("Refresh Shares", shares_num),
	&shares_num,
	|b, _| {
	let mut rng = rand::rngs::StdRng::seed_from_u64(0);
	b.iter(|| {
	black_box(refresh_shares::<E>(
	&mut setup.contexts,
	threshold,
	&mut rng,
	));
	});
	},
	);
	group.bench_function(
	BenchmarkId::new("Refresh Shares", shares_num),
	|b| {
	let mut rng = rand::rngs::StdRng::seed_from_u64(0);
	b.iter(|| {
	black_box(refresh_shares::<E>(
	&mut setup.contexts,
	threshold,
	&mut rng,
	));
	});
	},
	);

[piotr-roslaniec]

Feel free to address my comments & merge at will