Add zero segment

[fmoletta]

Adds zero segment fields & methods to MemorySegmentManager
These methods will be used by the new builtin, and are currenlty unused

[github-actions]

Benchmark Results for unmodified programs 🚀

Command	Mean [s]	Min [s]	Max [s]	Relative
base big_factorial	2.328 ± 0.016	2.308	2.362	1.01 ± 0.02
head big_factorial	2.299 ± 0.031	2.270	2.369	1.00

Command	Mean [s]	Min [s]	Max [s]	Relative
base big_fibonacci	2.367 ± 0.075	2.319	2.575	1.04 ± 0.03
head big_fibonacci	2.285 ± 0.020	2.253	2.315	1.00

Command	Mean [s]	Min [s]	Max [s]	Relative
base blake2s_integration_benchmark	8.572 ± 0.118	8.387	8.790	1.01 ± 0.05
head blake2s_integration_benchmark	8.520 ± 0.399	8.259	9.574	1.00

Command	Mean [s]	Min [s]	Max [s]	Relative
base compare_arrays_200000	2.366 ± 0.017	2.346	2.403	1.00 ± 0.01
head compare_arrays_200000	2.356 ± 0.021	2.318	2.386	1.00

Command	Mean [s]	Min [s]	Max [s]	Relative
base dict_integration_benchmark	1.496 ± 0.027	1.476	1.571	1.01 ± 0.02
head dict_integration_benchmark	1.480 ± 0.009	1.470	1.495	1.00

Command	Mean [s]	Min [s]	Max [s]	Relative
base field_arithmetic_get_square_benchmark	1.315 ± 0.009	1.301	1.325	1.01 ± 0.01
head field_arithmetic_get_square_benchmark	1.308 ± 0.017	1.289	1.346	1.00

Command	Mean [s]	Min [s]	Max [s]	Relative
base integration_builtins	8.552 ± 0.099	8.378	8.650	1.01 ± 0.02
head integration_builtins	8.495 ± 0.184	8.306	8.713	1.00

Command	Mean [s]	Min [s]	Max [s]	Relative
base keccak_integration_benchmark	8.803 ± 0.123	8.634	8.963	1.00 ± 0.04
head keccak_integration_benchmark	8.801 ± 0.332	8.572	9.646	1.00

Command	Mean [s]	Min [s]	Max [s]	Relative
base linear_search	2.404 ± 0.021	2.385	2.458	1.02 ± 0.01
head linear_search	2.356 ± 0.023	2.327	2.407	1.00

Command	Mean [s]	Min [s]	Max [s]	Relative
base math_cmp_and_pow_integration_benchmark	1.602 ± 0.024	1.572	1.658	1.00 ± 0.02
head math_cmp_and_pow_integration_benchmark	1.594 ± 0.012	1.568	1.616	1.00

Command	Mean [s]	Min [s]	Max [s]	Relative
base math_integration_benchmark	1.453 ± 0.017	1.436	1.488	1.01 ± 0.01
head math_integration_benchmark	1.441 ± 0.007	1.432	1.452	1.00

Command	Mean [s]	Min [s]	Max [s]	Relative
base memory_integration_benchmark	1.307 ± 0.011	1.286	1.321	1.03 ± 0.01
head memory_integration_benchmark	1.273 ± 0.009	1.260	1.286	1.00

Command	Mean [s]	Min [s]	Max [s]	Relative
base operations_with_data_structures_benchmarks	1.631 ± 0.006	1.622	1.641	1.00 ± 0.01
head operations_with_data_structures_benchmarks	1.628 ± 0.019	1.607	1.675	1.00

Command	Mean [ms]	Min [ms]	Max [ms]	Relative
base pedersen	597.0 ± 4.9	593.2	610.3	1.00 ± 0.02
head pedersen	596.4 ± 9.5	590.1	616.3	1.00

Command	Mean [ms]	Min [ms]	Max [ms]	Relative
base poseidon_integration_benchmark	999.7 ± 4.7	993.4	1006.3	1.01 ± 0.01
head poseidon_integration_benchmark	989.2 ± 6.5	978.1	997.3	1.00

Command	Mean [s]	Min [s]	Max [s]	Relative
base secp_integration_benchmark	1.872 ± 0.020	1.860	1.928	1.00
head secp_integration_benchmark	1.873 ± 0.041	1.846	1.985	1.00 ± 0.02

Command	Mean [ms]	Min [ms]	Max [ms]	Relative
base set_integration_benchmark	702.4 ± 6.5	695.1	715.3	1.01 ± 0.01
head set_integration_benchmark	697.9 ± 3.6	692.2	702.1	1.00

Command	Mean [s]	Min [s]	Max [s]	Relative
base uint256_integration_benchmark	4.683 ± 0.046	4.638	4.788	1.01 ± 0.01
head uint256_integration_benchmark	4.639 ± 0.044	4.589	4.700	1.00

[codecov]

Codecov Report

Attention: Patch coverage is 37.93103% with 18 lines in your changes are missing coverage. Please review.

Project coverage is 96.56%. Comparing base (44de614) to head (f7098eb).

Files	Patch %	Lines
vm/src/vm/vm_memory/memory_segments.rs	28.00%	18 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1668      +/-   ##
==========================================
- Coverage   96.61%   96.56%   -0.05%     
==========================================
  Files          95       95              
  Lines       38390    38409      +19     
==========================================
+ Hits        37089    37090       +1     
- Misses       1301     1319      +18     

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[Oppen]

Alternatively use Option<NonZeroUsize>.