feat(hints): "full word" from cairo_keccak.json

[Oppen]

Last remaining hint from whitelist cairo_keccak.json. The branch's name comes from its similarity to that of SHA256_INPUT. It turns out it's used for _copy_input instead, so it's misleading.
The hint:

ids.full_word = int(ids.n_bytes >= 8)

Fixes #1020

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	2.509 ± 0.029	2.476	2.570	1.00 ± 0.02
head blake2s_integration_benchmark	2.508 ± 0.039	2.475	2.595	1.00

Command	Mean [s]	Min [s]	Max [s]	Relative
base compare_arrays_200000	3.050 ± 0.041	2.996	3.118	1.01 ± 0.02
head compare_arrays_200000	3.009 ± 0.028	2.985	3.081	1.00

Command	Mean [s]	Min [s]	Max [s]	Relative
base dict_integration_benchmark	2.408 ± 0.011	2.395	2.426	1.01 ± 0.01
head dict_integration_benchmark	2.396 ± 0.017	2.365	2.424	1.00

Command	Mean [s]	Min [s]	Max [s]	Relative
base factorial_multirun	3.757 ± 0.015	3.737	3.775	1.01 ± 0.01
head factorial_multirun	3.730 ± 0.020	3.708	3.769	1.00

Command	Mean [s]	Min [s]	Max [s]	Relative
base fibonacci_1000_multirun	3.024 ± 0.017	3.001	3.050	1.01 ± 0.01
head fibonacci_1000_multirun	3.005 ± 0.029	2.979	3.067	1.00

Command	Mean [ms]	Min [ms]	Max [ms]	Relative
base field_arithmetic_get_square_benchmark	130.0 ± 1.3	128.5	132.1	1.00
head field_arithmetic_get_square_benchmark	132.3 ± 3.2	129.7	139.5	1.02 ± 0.03

Command	Mean [s]	Min [s]	Max [s]	Relative
base integration_builtins	2.986 ± 0.033	2.955	3.056	1.02 ± 0.01
head integration_builtins	2.939 ± 0.010	2.923	2.960	1.00

Command	Mean [s]	Min [s]	Max [s]	Relative
base keccak_integration_benchmark	2.678 ± 0.063	2.645	2.856	1.00 ± 0.02
head keccak_integration_benchmark	2.667 ± 0.019	2.646	2.708	1.00

Command	Mean [s]	Min [s]	Max [s]	Relative
base linear_search	3.164 ± 0.016	3.146	3.194	1.00
head linear_search	3.187 ± 0.041	3.143	3.271	1.01 ± 0.01

Command	Mean [s]	Min [s]	Max [s]	Relative
base math_cmp_and_pow_integration_benchmark	2.695 ± 0.025	2.660	2.750	1.00
head math_cmp_and_pow_integration_benchmark	2.713 ± 0.028	2.683	2.768	1.01 ± 0.01

Command	Mean [s]	Min [s]	Max [s]	Relative
base math_integration_benchmark	2.475 ± 0.009	2.461	2.496	1.00
head math_integration_benchmark	2.481 ± 0.010	2.467	2.494	1.00 ± 0.01

Command	Mean [s]	Min [s]	Max [s]	Relative
base memory_integration_benchmark	2.131 ± 0.011	2.118	2.153	1.01 ± 0.01
head memory_integration_benchmark	2.120 ± 0.011	2.104	2.140	1.00

Command	Mean [s]	Min [s]	Max [s]	Relative
base operations_with_data_structures_benchmarks	2.241 ± 0.045	2.214	2.363	1.00 ± 0.02
head operations_with_data_structures_benchmarks	2.233 ± 0.020	2.222	2.288	1.00

Command	Mean [ms]	Min [ms]	Max [ms]	Relative
base pedersen	784.0 ± 6.3	780.2	801.0	1.00 ± 0.01
head pedersen	782.0 ± 4.0	777.9	790.3	1.00

Command	Mean [s]	Min [s]	Max [s]	Relative
base poseidon_integration_benchmark	1.516 ± 0.021	1.500	1.571	1.01 ± 0.01
head poseidon_integration_benchmark	1.507 ± 0.004	1.501	1.514	1.00

Command	Mean [s]	Min [s]	Max [s]	Relative
base secp_integration_benchmark	2.353 ± 0.009	2.342	2.371	1.00
head secp_integration_benchmark	2.361 ± 0.014	2.340	2.387	1.00 ± 0.01

Command	Mean [s]	Min [s]	Max [s]	Relative
base set_integration_benchmark	1.685 ± 0.015	1.675	1.727	1.00
head set_integration_benchmark	1.689 ± 0.018	1.669	1.726	1.00 ± 0.01

Command	Mean [s]	Min [s]	Max [s]	Relative
base uint256_integration_benchmark	3.901 ± 0.020	3.884	3.934	1.00 ± 0.01
head uint256_integration_benchmark	3.898 ± 0.020	3.880	3.949	1.00

[codecov]

Codecov Report

Merging #1058 (b5cc938) into main (0fad948) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main    #1058   +/-   ##
=======================================
  Coverage   98.10%   98.10%           
=======================================
  Files          84       84           
  Lines       33994    34008   +14     
=======================================
+ Hits        33349    33363   +14     
  Misses        645      645           

Impacted Files	Coverage Δ
...int_processor/builtin_hint_processor_definition.rs	99.01% <100.00%> (+<0.01%)	⬆️
...uiltin_hint_processor/cairo_keccak/keccak_hints.rs	94.09% <100.00%> (+0.25%)	⬆️

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