simd-0284: alt_bn128 little endian compatibility

[0x0ece]

• removed code for activated feat fix_alt_bn128_multiplication_input_length
• added code for new feat alt_bn128_little_endian
• detailed tests for all ops (found+fixed bug in compress/decompress) -- this is because solfuzz-agave will need to be upgraded to 4.0 before we can have proper test-vectors, so it might take a while...

Agave: anza-xyz/agave#8771, anza-xyz/solana-sdk#267
WIP test vectors firedancer-io/solana-conformance#196

[github-actions]

Performance Measurements ⏳

Suite	Baseline	New	Change
backtest mainnet-368528500-perf per slot	0.050332 s	0.050277 s	-0.109% ✅
backtest mainnet-368528500-perf snapshot load	1.626 s	1.614 s	-0.738% ✅
backtest mainnet-368528500-perf total elapsed	50.332047 s	50.277232 s	-0.109% ✅
firedancer mem usage with mainnet.toml	993.23 GiB	993.23 GiB	0.000% ✅