docs: document deserialization modules and update lib module's doc

[MegaRedHand]

Description

This PR updates the lib module's documentation, and adds module level documentation for the Program deserialization related modules. It also makes the deserialization_utils module private and deletes an unused error struct.

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 big_factorial	3.748 ± 0.023	3.712	3.794	1.00 ± 0.01
head big_factorial	3.732 ± 0.020	3.712	3.770	1.00

Command	Mean [s]	Min [s]	Max [s]	Relative
base big_fibonacci	3.240 ± 0.017	3.216	3.265	1.01 ± 0.01
head big_fibonacci	3.213 ± 0.023	3.192	3.267	1.00

Command	Mean [s]	Min [s]	Max [s]	Relative
base blake2s_integration_benchmark	9.094 ± 0.053	9.044	9.211	1.00
head blake2s_integration_benchmark	9.184 ± 0.095	9.102	9.431	1.01 ± 0.01

Command	Mean [s]	Min [s]	Max [s]	Relative
base compare_arrays_200000	3.242 ± 0.025	3.210	3.298	1.02 ± 0.01
head compare_arrays_200000	3.190 ± 0.019	3.171	3.227	1.00

Command	Mean [s]	Min [s]	Max [s]	Relative
base dict_integration_benchmark	2.239 ± 0.009	2.228	2.254	1.01 ± 0.01
head dict_integration_benchmark	2.209 ± 0.019	2.198	2.260	1.00

Command	Mean [s]	Min [s]	Max [s]	Relative
base field_arithmetic_get_square_benchmark	1.703 ± 0.012	1.695	1.734	1.00
head field_arithmetic_get_square_benchmark	1.716 ± 0.010	1.704	1.732	1.01 ± 0.01

Command	Mean [s]	Min [s]	Max [s]	Relative
base integration_builtins	9.101 ± 0.022	9.058	9.139	1.00
head integration_builtins	9.186 ± 0.072	9.128	9.357	1.01 ± 0.01

Command	Mean [s]	Min [s]	Max [s]	Relative
base keccak_integration_benchmark	9.328 ± 0.167	9.175	9.729	1.01 ± 0.02
head keccak_integration_benchmark	9.193 ± 0.086	9.133	9.370	1.00

Command	Mean [s]	Min [s]	Max [s]	Relative
base linear_search	3.290 ± 0.018	3.263	3.320	1.00 ± 0.01
head linear_search	3.281 ± 0.035	3.257	3.373	1.00

Command	Mean [s]	Min [s]	Max [s]	Relative
base math_cmp_and_pow_integration_benchmark	2.365 ± 0.008	2.353	2.375	1.02 ± 0.01
head math_cmp_and_pow_integration_benchmark	2.320 ± 0.014	2.302	2.337	1.00

Command	Mean [s]	Min [s]	Max [s]	Relative
base math_integration_benchmark	2.169 ± 0.015	2.150	2.202	1.00 ± 0.01
head math_integration_benchmark	2.159 ± 0.015	2.146	2.197	1.00

Command	Mean [s]	Min [s]	Max [s]	Relative
base memory_integration_benchmark	1.868 ± 0.014	1.855	1.894	1.00
head memory_integration_benchmark	1.877 ± 0.010	1.858	1.889	1.00 ± 0.01

Command	Mean [s]	Min [s]	Max [s]	Relative
base operations_with_data_structures_benchmarks	2.165 ± 0.072	2.130	2.365	1.03 ± 0.04
head operations_with_data_structures_benchmarks	2.110 ± 0.021	2.088	2.157	1.00

Command	Mean [ms]	Min [ms]	Max [ms]	Relative
base pedersen	821.3 ± 2.0	817.9	824.8	1.00
head pedersen	821.5 ± 2.6	818.4	826.9	1.00 ± 0.00

Command	Mean [s]	Min [s]	Max [s]	Relative
base poseidon_integration_benchmark	1.497 ± 0.008	1.487	1.509	1.00 ± 0.01
head poseidon_integration_benchmark	1.492 ± 0.004	1.486	1.497	1.00

Command	Mean [s]	Min [s]	Max [s]	Relative
base secp_integration_benchmark	2.476 ± 0.021	2.460	2.535	1.00 ± 0.01
head secp_integration_benchmark	2.475 ± 0.017	2.456	2.510	1.00

Command	Mean [s]	Min [s]	Max [s]	Relative
base set_integration_benchmark	1.259 ± 0.010	1.251	1.280	1.02 ± 0.01
head set_integration_benchmark	1.239 ± 0.011	1.228	1.263	1.00

Command	Mean [s]	Min [s]	Max [s]	Relative
base uint256_integration_benchmark	6.033 ± 0.029	5.999	6.083	1.00
head uint256_integration_benchmark	6.044 ± 0.047	6.001	6.147	1.00 ± 0.01

[codecov]

Codecov Report

Merging #1334 (04c3575) into main (7ee9be8) will increase coverage by 0.03%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main    #1334      +/-   ##
==========================================
+ Coverage   97.47%   97.50%   +0.03%     
==========================================
  Files          92       92              
  Lines       37692    37679      -13     
==========================================
  Hits        36740    36740              
+ Misses        952      939      -13     

Impacted Files	Coverage Δ
vm/src/serde/deserialize_program.rs	97.32% <ø> (ø)
vm/src/lib.rs	100.00% <100.00%> (ø)
vm/src/serde/deserialize_utils.rs	99.28% <100.00%> (+2.24%)	⬆️

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