tests: add an env variable bench for testing #89

Performance Gate Passed

🆕 163 new benchmarks

	Benchmark	`BASE`	`HEAD`	Change
🆕	`a`	N/A	254.7 ns	N/A
🆕	`b`	N/A	2.8 µs	N/A
🆕	`a`	N/A	254.7 ns	N/A
🆕	`b`	N/A	3.4 µs	N/A
🆕	`fibo_iterative`	N/A	126.7 ns	N/A
🆕	`fibo_recursive`	N/A	916.7 ns	N/A
🆕	`fibo_recursive_cached`	N/A	6.3 µs	N/A
🆕	`sum_fold`	N/A	254.4 ns	N/A
🆕	`build_vec`	N/A	2.8 µs	N/A
🆕	`iter`	N/A	< 1 ns	N/A
🆕	`iter_batched_large_input`	N/A	< 1 ns	N/A
🆕	`iter_batched_per_iteration`	N/A	< 1 ns	N/A
🆕	`iter_batched_ref_large_input`	N/A	< 1 ns	N/A
🆕	`iter_batched_ref_per_iteration`	N/A	< 1 ns	N/A
🆕	`iter_batched_ref_small_input`	N/A	< 1 ns	N/A
🆕	`iter_batched_small_input`	N/A	< 1 ns	N/A
🆕	`iter_with_large_drop`	N/A	< 1 ns	N/A
🆕	`iter_with_large_setup`	N/A	< 1 ns	N/A
🆕	`iter_with_setup`	N/A	< 1 ns	N/A
🆕	`Iterative`	N/A	103.6 ns	N/A
...	...	...	...	...

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