refactor: Remove unused code & use constants whenever possible for builtin instance definitions

[fmoletta]

Builtin Instance Defs

• Removes unused/ignored fields
• Turns constant field values into actual constants
• Implement Default trait instead of a method named default

  Builtin Runners

• Removes fields cells_per_instance, n_input_cells & cpu_components_per_step, relying on constants instead

  Other

• exec_scope macro now uses full path for ExecScopes and no longer requires it to be imported separately

[github-actions[bot]]

Benchmark Results for unmodified programs :rocket:

Command	Mean [s]	Min [s]	Max [s]	Relative
base big_factorial	2.325 ± 0.059	2.268	2.458	1.01 ± 0.03
head big_factorial	2.306 ± 0.023	2.268	2.347	1.00

Command	Mean [s]	Min [s]	Max [s]	Relative
base big_fibonacci	2.305 ± 0.036	2.266	2.374	1.01 ± 0.02
head big_fibonacci	2.292 ± 0.031	2.255	2.355	1.00

Command	Mean [s]	Min [s]	Max [s]	Relative
base blake2s_integration_benchmark	8.587 ± 0.187	8.299	8.740	1.01 ± 0.03
head blake2s_integration_benchmark	8.478 ± 0.148	8.308	8.700	1.00

Command	Mean [s]	Min [s]	Max [s]	Relative
base compare_arrays_200000	2.344 ± 0.024	2.313	2.397	1.00
head compare_arrays_200000	2.349 ± 0.039	2.321	2.452	1.00 ± 0.02

Command	Mean [s]	Min [s]	Max [s]	Relative
base dict_integration_benchmark	1.474 ± 0.018	1.454	1.512	1.01 ± 0.02
head dict_integration_benchmark	1.465 ± 0.018	1.446	1.495	1.00

Command	Mean [s]	Min [s]	Max [s]	Relative
base field_arithmetic_get_square_benchmark	1.325 ± 0.023	1.302	1.385	1.01 ± 0.02
head field_arithmetic_get_square_benchmark	1.314 ± 0.012	1.295	1.333	1.00

Command	Mean [s]	Min [s]	Max [s]	Relative
base integration_builtins	8.532 ± 0.194	8.334	8.787	1.01 ± 0.03
head integration_builtins	8.438 ± 0.155	8.318	8.714	1.00

Command	Mean [s]	Min [s]	Max [s]	Relative
base keccak_integration_benchmark	8.949 ± 0.436	8.539	10.047	1.01 ± 0.06
head keccak_integration_benchmark	8.879 ± 0.237	8.658	9.492	1.00

Command	Mean [s]	Min [s]	Max [s]	Relative
base linear_search	2.376 ± 0.053	2.336	2.523	1.01 ± 0.03
head linear_search	2.364 ± 0.048	2.323	2.434	1.00

Command	Mean [s]	Min [s]	Max [s]	Relative
base math_cmp_and_pow_integration_benchmark	1.585 ± 0.013	1.563	1.599	1.00
head math_cmp_and_pow_integration_benchmark	1.596 ± 0.029	1.566	1.664	1.01 ± 0.02

Command	Mean [s]	Min [s]	Max [s]	Relative
base math_integration_benchmark	1.426 ± 0.015	1.409	1.444	1.00
head math_integration_benchmark	1.446 ± 0.027	1.413	1.485	1.01 ± 0.02

Command	Mean [s]	Min [s]	Max [s]	Relative
base memory_integration_benchmark	1.289 ± 0.034	1.254	1.354	1.00 ± 0.03
head memory_integration_benchmark	1.283 ± 0.028	1.249	1.342	1.00

Command	Mean [s]	Min [s]	Max [s]	Relative
base operations_with_data_structures_benchmarks	1.614 ± 0.016	1.592	1.652	1.00
head operations_with_data_structures_benchmarks	1.618 ± 0.016	1.602	1.651	1.00 ± 0.01

Command	Mean [ms]	Min [ms]	Max [ms]	Relative
base pedersen	591.6 ± 4.2	587.5	601.6	1.00
head pedersen	594.2 ± 4.1	590.5	603.1	1.00 ± 0.01

Command	Mean [ms]	Min [ms]	Max [ms]	Relative
base poseidon_integration_benchmark	972.2 ± 7.9	964.0	989.6	1.01 ± 0.01
head poseidon_integration_benchmark	962.1 ± 4.9	952.2	968.4	1.00

Command	Mean [s]	Min [s]	Max [s]	Relative
base secp_integration_benchmark	1.870 ± 0.013	1.856	1.899	1.00
head secp_integration_benchmark	1.879 ± 0.015	1.867	1.911	1.01 ± 0.01

Command	Mean [ms]	Min [ms]	Max [ms]	Relative
base set_integration_benchmark	721.4 ± 1.0	719.8	722.9	1.00
head set_integration_benchmark	721.4 ± 4.6	716.0	730.8	1.00 ± 0.01

Command	Mean [s]	Min [s]	Max [s]	Relative
base uint256_integration_benchmark	4.734 ± 0.107	4.620	4.941	1.01 ± 0.03
head uint256_integration_benchmark	4.700 ± 0.054	4.612	4.823	1.00

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 96.27329% with 12 lines in your changes are missing coverage. Please review.

Project coverage is 94.94%. Comparing base (6de8f56) to head (0f6870a).

Files	Patch %	Lines
vm/src/vm/runners/builtin_runner/modulo.rs	0.00%	8 Missing :warning:
vm/src/vm/runners/builtin_runner/mod.rs	97.43%	2 Missing :warning:
vm/src/vm/runners/builtin_runner/bitwise.rs	96.00%	1 Missing :warning:
vm/src/vm/runners/cairo_runner.rs	95.65%	1 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #1707 +/- ## ========================================== - Coverage 94.98% 94.94% -0.05% ========================================== Files 99 98 -1 Lines 38579 38081 -498 ========================================== - Hits 36646 36155 -491 + Misses 1933 1926 -7 ```

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