fix: blockchash for devnet-0

[rakita]

move code to the Context::block_hash and dont warm load storage if it is more than 256 blocks.

[github-actions]

Valgrind Results:

==3873== Cachegrind, a cache and branch-prediction profiler
==3873== Copyright (C) 2002-2017, and GNU GPL'd, by Nicholas Nethercote et al.
==3873== Using Valgrind-3.18.1 and LibVEX; rerun with -h for copyright info
==3873== Command: target/release/snailtracer
==3873== 
--3873-- warning: L3 cache found, using its data for the LL simulation.
Running snailtracer example!
elapsed: 1.810012483s
==3873== 
==3873== I   refs:      429,369,652
==3873== I1  misses:          3,131
==3873== LLi misses:          2,794
==3873== I1  miss rate:        0.00%
==3873== LLi miss rate:        0.00%
==3873== 
==3873== D   refs:      206,204,460  (133,650,197 rd   + 72,554,263 wr)
==3873== D1  misses:        344,590  (    204,509 rd   +    140,081 wr)
==3873== LLd misses:        137,635  (      4,273 rd   +    133,362 wr)
==3873== D1  miss rate:         0.2% (        0.2%     +        0.2%  )
==3873== LLd miss rate:         0.1% (        0.0%     +        0.2%  )
==3873== 
==3873== LL refs:           347,721  (    207,640 rd   +    140,081 wr)
==3873== LL misses:         140,429  (      7,067 rd   +    133,362 wr)
==3873== LL miss rate:          0.0% (        0.0%     +        0.2%  )