fix: cometbft contract

[j75689]

Description

1. In the cometbft contract, if there is any error when executing apply_light_block, an Error error code will be returned instead of returning validatorSetChanged=false.
2. relayer and bls key should be updated and encoded to bytes.

Related

https://github.com/bnb-chain/op-geth/blob/f9643c4e38c6911714bdae55a3f1bb937100c2be/core/vm/lightclient/lightclient.go#L86
https://github.com/bnb-chain/op-geth/blob/f9643c4e38c6911714bdae55a3f1bb937100c2be/core/vm/contracts.go#L1322

[github-actions]

Valgrind Results:

==5261== Cachegrind, a cache and branch-prediction profiler
==5261== Copyright (C) 2002-2017, and GNU GPL'd, by Nicholas Nethercote et al.
==5261== Using Valgrind-3.18.1 and LibVEX; rerun with -h for copyright info
==5261== Command: target/release/snailtracer
==5261== 
--5261-- warning: L3 cache found, using its data for the LL simulation.
==5261== brk segment overflow in thread #1: can't grow to 0x4cb4000
==5261== (see section Limitations in user manual)
==5261== NOTE: further instances of this message will not be shown
Snailtracer Host+Interpreter benchmark (5.7s) ... 1_753_142_871.000 ns/iter (1.000 R²)
==5261== 
==5261== I   refs:      1,348,416,905
==5261== I1  misses:            7,703
==5261== LLi misses:            3,060
==5261== I1  miss rate:          0.00%
==5261== LLi miss rate:          0.00%
==5261== 
==5261== D   refs:        677,296,448  (452,038,814 rd   + 225,257,634 wr)
==5261== D1  misses:        1,227,924  (    686,154 rd   +     541,770 wr)
==5261== LLd misses:          201,148  (      4,162 rd   +     196,986 wr)
==5261== D1  miss rate:           0.2% (        0.2%     +         0.2%  )
==5261== LLd miss rate:           0.0% (        0.0%     +         0.1%  )
==5261== 
==5261== LL refs:           1,235,627  (    693,857 rd   +     541,770 wr)
==5261== LL misses:           204,208  (      7,222 rd   +     196,986 wr)
==5261== LL miss rate:            0.0% (        0.0%     +         0.1%  )