feat(criterion): make `Bencher` implement `Send + Sync` #116

Performance Regression: -11.48%

⚡ 11 improvements
❌ 6 regressions
✅ 150 untouched

⚠️ Please fix the performance issues or acknowledge them on CodSpeed.

	Benchmark	`BASE`	`HEAD`	Change
⚡	`Iterative`	162.5 ns	132.5 ns	+22.64%
⚡	`Iterative[20]`	162.5 ns	132.5 ns	+22.64%
⚡	`Iterative[21]`	164.2 ns	134.2 ns	+22.36%
❌	`fibonacci_custom_measurement`	916.7 ns	945.8 ns	-3.08%
⚡	`sleep_100ms`	595.3 ns	536.9 ns	+10.86%
⚡	`sleep_10ms`	566.1 ns	536.9 ns	+5.43%
⚡	`sleep_1ms`	566.1 ns	536.9 ns	+5.43%
⚡	`sleep_50ms`	595.3 ns	536.9 ns	+10.86%
❌	`from_elem[1024]`	1.8 µs	1.9 µs	-3.1%
❌	`from_elem_decimal[1024]`	1.8 µs	1.9 µs	-3.1%
❌	`bench_array1[10]`	225 ns	254.2 ns	-11.48%
❌	`bench_array2[10]`	225 ns	254.2 ns	-11.48%
❌	`mut_borrow`	895 ns	924.2 ns	-3.16%
⚡	`recursive_memoized[BTreeMap<u64, u64>, 0]`	430 ns	400.8 ns	+7.28%
⚡	`recursive_memoized[HashMap<u64, u64>, 0]`	958.3 ns	929.2 ns	+3.14%
⚡	`instant`	363.6 ns	334.4 ns	+8.72%
⚡	`system_time`	363.6 ns	334.4 ns	+8.72%