Fix: cairo_native swaps the high and low fields of U256 compared to Cairo's u256

[edg-l]

Fixes #715

I introduced this when i added the corelib tests, instead of changing the field order of the u256, instead i swapped the tests and starknet syscall impl, but that was wrong, now its fixed

Checklist

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

[github-actions]

Benchmarking results

Benchmark for program factorial_2M

Open benchmarks

Command	Mean [s]	Min [s]	Max [s]	Relative
Cairo-vm (Rust, Cairo 1)	11.300 ± 0.063	11.234	11.425	23.46 ± 0.26
cairo-native (embedded AOT)	1.541 ± 0.010	1.522	1.554	3.20 ± 0.04
cairo-native (embedded JIT using LLVM's ORC Engine)	1.617 ± 0.009	1.605	1.632	3.36 ± 0.04
cairo-native (standalone AOT)	0.654 ± 0.002	0.651	0.656	1.36 ± 0.01
cairo-native (standalone AOT with -march=native)	0.482 ± 0.005	0.480	0.495	1.00

Benchmark for program fib_2M

Open benchmarks

Command	Mean [s]	Min [s]	Max [s]	Relative
Cairo-vm (Rust, Cairo 1)	10.726 ± 0.030	10.686	10.774	1317.98 ± 23.74
cairo-native (embedded AOT)	1.110 ± 0.006	1.103	1.123	136.35 ± 2.53
cairo-native (embedded JIT using LLVM's ORC Engine)	1.118 ± 0.003	1.111	1.123	137.40 ± 2.48
cairo-native (standalone AOT)	0.008 ± 0.000	0.008	0.012	1.04 ± 0.03
cairo-native (standalone AOT with -march=native)	0.008 ± 0.000	0.008	0.010	1.00

Benchmark for program logistic_map

Open benchmarks

Command	Mean [s]	Min [s]	Max [s]	Relative
Cairo-vm (Rust, Cairo 1)	1.909 ± 0.013	1.893	1.937	28.88 ± 0.21
cairo-native (embedded AOT)	1.257 ± 0.006	1.251	1.266	19.01 ± 0.10
cairo-native (embedded JIT using LLVM's ORC Engine)	1.431 ± 0.013	1.414	1.451	21.64 ± 0.20
cairo-native (standalone AOT)	0.107 ± 0.000	0.107	0.107	1.62 ± 0.00
cairo-native (standalone AOT with -march=native)	0.066 ± 0.000	0.066	0.066	1.00

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 91.68%. Comparing base (ccbd2da) to head (0e9d0e4).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #720   +/-   ##
=======================================
  Coverage   91.68%   91.68%           
=======================================
  Files         118      118           
  Lines       32644    32644           
=======================================
  Hits        29931    29931           
  Misses       2713     2713           

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