feat: expose data_len accessor in Program

[Oppen]

While the length of the program data can be obtained from .data_iter().count(), it's obviously much faster to get it in O(1), so let's add a method for it.

Checklist

• Linked to Github Issue
• Unit tests added
• Integration tests added.
• This change requires new documentation.
  • Documentation has been added/updated.
  • CHANGELOG has been updated.

[github-actions]

Benchmark Results for unmodified programs 🚀

Command	Mean [s]	Min [s]	Max [s]	Relative
base blake2s_integration_benchmark	2.645 ± 0.031	2.616	2.719	1.00
head blake2s_integration_benchmark	2.662 ± 0.039	2.632	2.748	1.01 ± 0.02

Command	Mean [s]	Min [s]	Max [s]	Relative
base compare_arrays_200000	3.339 ± 0.060	3.284	3.481	1.01 ± 0.02
head compare_arrays_200000	3.322 ± 0.019	3.300	3.365	1.00

Command	Mean [s]	Min [s]	Max [s]	Relative
base dict_integration_benchmark	2.580 ± 0.119	2.523	2.916	1.02 ± 0.05
head dict_integration_benchmark	2.537 ± 0.008	2.524	2.553	1.00

Command	Mean [s]	Min [s]	Max [s]	Relative
base factorial_multirun	3.936 ± 0.025	3.903	3.991	1.00
head factorial_multirun	3.951 ± 0.016	3.930	3.984	1.00 ± 0.01

Command	Mean [s]	Min [s]	Max [s]	Relative
base fibonacci_1000_multirun	3.242 ± 0.186	3.164	3.768	1.01 ± 0.06
head fibonacci_1000_multirun	3.199 ± 0.014	3.178	3.225	1.00

Command	Mean [s]	Min [s]	Max [s]	Relative
base integration_builtins	3.222 ± 0.017	3.201	3.246	1.00
head integration_builtins	3.255 ± 0.027	3.227	3.316	1.01 ± 0.01

Command	Mean [s]	Min [s]	Max [s]	Relative
base keccak_integration_benchmark	2.825 ± 0.016	2.803	2.844	1.00
head keccak_integration_benchmark	2.840 ± 0.010	2.817	2.851	1.01 ± 0.01

Command	Mean [s]	Min [s]	Max [s]	Relative
base linear_search	3.468 ± 0.210	3.374	4.061	1.02 ± 0.06
head linear_search	3.404 ± 0.034	3.366	3.487	1.00

Command	Mean [s]	Min [s]	Max [s]	Relative
base math_cmp_and_pow_integration_benchmark	2.876 ± 0.029	2.843	2.942	1.00
head math_cmp_and_pow_integration_benchmark	2.884 ± 0.042	2.860	2.998	1.00 ± 0.02

Command	Mean [s]	Min [s]	Max [s]	Relative
base math_integration_benchmark	2.616 ± 0.016	2.598	2.640	1.00
head math_integration_benchmark	2.639 ± 0.011	2.622	2.663	1.01 ± 0.01

Command	Mean [s]	Min [s]	Max [s]	Relative
base memory_integration_benchmark	2.280 ± 0.015	2.264	2.317	1.00
head memory_integration_benchmark	2.291 ± 0.009	2.282	2.314	1.00 ± 0.01

Command	Mean [s]	Min [s]	Max [s]	Relative
base operations_with_data_structures_benchmarks	2.353 ± 0.013	2.340	2.381	1.00
head operations_with_data_structures_benchmarks	2.355 ± 0.016	2.336	2.388	1.00 ± 0.01

Command	Mean [s]	Min [s]	Max [s]	Relative
base pedersen	3.236 ± 0.032	3.218	3.326	1.00 ± 0.01
head pedersen	3.234 ± 0.012	3.223	3.266	1.00

Command	Mean [s]	Min [s]	Max [s]	Relative
base poseidon_integration_benchmark	1.561 ± 0.006	1.554	1.576	1.00
head poseidon_integration_benchmark	1.561 ± 0.007	1.552	1.575	1.00 ± 0.01

Command	Mean [s]	Min [s]	Max [s]	Relative
base secp_integration_benchmark	2.473 ± 0.015	2.451	2.494	1.00
head secp_integration_benchmark	2.474 ± 0.019	2.463	2.521	1.00 ± 0.01

Command	Mean [s]	Min [s]	Max [s]	Relative
base set_integration_benchmark	1.716 ± 0.006	1.709	1.731	1.00
head set_integration_benchmark	1.724 ± 0.012	1.711	1.749	1.00 ± 0.01

Command	Mean [s]	Min [s]	Max [s]	Relative
base uint256_integration_benchmark	4.089 ± 0.018	4.069	4.127	1.00
head uint256_integration_benchmark	4.105 ± 0.014	4.080	4.123	1.00 ± 0.01

[codecov]

Codecov Report

Merging #1022 (3f4d89e) into main (86aac52) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main    #1022   +/-   ##
=======================================
  Coverage   98.05%   98.05%           
=======================================
  Files          77       77           
  Lines       31911    31944   +33     
=======================================
+ Hits        31289    31322   +33     
  Misses        622      622           

Impacted Files	Coverage Δ
src/types/program.rs	99.29% <100.00%> (+0.04%)	⬆️

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