Restore `flamegraph` target

[fmoletta]

Installing flamegraph with locked dependencies works for rust 1.70, so we can restore this target

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Comparison is base (28e055e) 97.16% compared to head (cf69a47) 97.16%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #1615 +/- ## ======================================= Coverage 97.16% 97.16% ======================================= Files 92 92 Lines 37369 37369 ======================================= Hits 36309 36309 Misses 1060 1060 ```

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[github-actions[bot]]

Benchmark Results for unmodified programs :rocket:

Command	Mean [s]	Min [s]	Max [s]	Relative
base big_factorial	2.291 ± 0.026	2.256	2.326	1.01 ± 0.01
head big_factorial	2.263 ± 0.017	2.244	2.288	1.00

Command	Mean [s]	Min [s]	Max [s]	Relative
base big_fibonacci	2.246 ± 0.011	2.234	2.270	1.00
head big_fibonacci	2.252 ± 0.019	2.230	2.278	1.00 ± 0.01

Command	Mean [s]	Min [s]	Max [s]	Relative
base blake2s_integration_benchmark	8.229 ± 0.084	8.160	8.370	1.00
head blake2s_integration_benchmark	8.235 ± 0.098	8.152	8.407	1.00 ± 0.02

Command	Mean [s]	Min [s]	Max [s]	Relative
base compare_arrays_200000	2.311 ± 0.024	2.289	2.351	1.02 ± 0.01
head compare_arrays_200000	2.276 ± 0.016	2.265	2.309	1.00

Command	Mean [s]	Min [s]	Max [s]	Relative
base dict_integration_benchmark	1.450 ± 0.007	1.445	1.469	1.00 ± 0.01
head dict_integration_benchmark	1.450 ± 0.011	1.440	1.471	1.00

Command	Mean [s]	Min [s]	Max [s]	Relative
base field_arithmetic_get_square_benchmark	1.289 ± 0.012	1.272	1.304	1.00
head field_arithmetic_get_square_benchmark	1.295 ± 0.019	1.276	1.343	1.01 ± 0.02

Command	Mean [s]	Min [s]	Max [s]	Relative
base integration_builtins	8.282 ± 0.088	8.180	8.413	1.00 ± 0.02
head integration_builtins	8.266 ± 0.102	8.162	8.464	1.00

Command	Mean [s]	Min [s]	Max [s]	Relative
base keccak_integration_benchmark	8.525 ± 0.092	8.437	8.657	1.00
head keccak_integration_benchmark	8.631 ± 0.179	8.451	9.076	1.01 ± 0.02

Command	Mean [s]	Min [s]	Max [s]	Relative
base linear_search	2.349 ± 0.011	2.340	2.376	1.01 ± 0.01
head linear_search	2.325 ± 0.016	2.302	2.348	1.00

Command	Mean [s]	Min [s]	Max [s]	Relative
base math_cmp_and_pow_integration_benchmark	1.586 ± 0.008	1.577	1.598	1.00
head math_cmp_and_pow_integration_benchmark	1.590 ± 0.017	1.569	1.623	1.00 ± 0.01

Command	Mean [s]	Min [s]	Max [s]	Relative
base math_integration_benchmark	1.453 ± 0.006	1.446	1.464	1.01 ± 0.01
head math_integration_benchmark	1.438 ± 0.012	1.429	1.471	1.00

Command	Mean [s]	Min [s]	Max [s]	Relative
base memory_integration_benchmark	1.284 ± 0.011	1.274	1.305	1.02 ± 0.01
head memory_integration_benchmark	1.265 ± 0.008	1.253	1.273	1.00

Command	Mean [s]	Min [s]	Max [s]	Relative
base operations_with_data_structures_benchmarks	1.611 ± 0.010	1.597	1.628	1.00 ± 0.01
head operations_with_data_structures_benchmarks	1.611 ± 0.009	1.600	1.633	1.00

Command	Mean [ms]	Min [ms]	Max [ms]	Relative
base pedersen	605.6 ± 3.0	602.4	612.4	1.00
head pedersen	606.0 ± 2.0	603.8	610.2	1.00 ± 0.01

Command	Mean [s]	Min [s]	Max [s]	Relative
base poseidon_integration_benchmark	1.064 ± 0.006	1.053	1.076	1.00 ± 0.01
head poseidon_integration_benchmark	1.060 ± 0.002	1.057	1.064	1.00

Command	Mean [s]	Min [s]	Max [s]	Relative
base secp_integration_benchmark	1.917 ± 0.007	1.904	1.930	1.00
head secp_integration_benchmark	1.924 ± 0.009	1.913	1.939	1.00 ± 0.01

Command	Mean [ms]	Min [ms]	Max [ms]	Relative
base set_integration_benchmark	773.2 ± 2.4	770.6	776.6	1.00 ± 0.01
head set_integration_benchmark	772.7 ± 9.1	765.9	794.4	1.00

Command	Mean [s]	Min [s]	Max [s]	Relative
base uint256_integration_benchmark	4.566 ± 0.037	4.524	4.617	1.00 ± 0.01
head uint256_integration_benchmark	4.549 ± 0.035	4.515	4.601	1.00