chore(EOF): rename extcall opcode/names

[rakita]

ref: ipsilon/eof#68

[github-actions]

Valgrind Results:

==3984== Cachegrind, a cache and branch-prediction profiler
==3984== Copyright (C) 2002-2017, and GNU GPL'd, by Nicholas Nethercote et al.
==3984== Using Valgrind-3.18.1 and LibVEX; rerun with -h for copyright info
==3984== Command: target/release/snailtracer
==3984== 
--3984-- warning: L3 cache found, using its data for the LL simulation.
Running snailtracer example!
elapsed: 1.855371478s
==3984== 
==3984== I   refs:      429,370,608
==3984== I1  misses:          3,140
==3984== LLi misses:          2,801
==3984== I1  miss rate:        0.00%
==3984== LLi miss rate:        0.00%
==3984== 
==3984== D   refs:      206,204,747  (133,650,428 rd   + 72,554,319 wr)
==3984== D1  misses:        345,273  (    205,170 rd   +    140,103 wr)
==3984== LLd misses:        137,634  (      4,271 rd   +    133,363 wr)
==3984== D1  miss rate:         0.2% (        0.2%     +        0.2%  )
==3984== LLd miss rate:         0.1% (        0.0%     +        0.2%  )
==3984== 
==3984== LL refs:           348,413  (    208,310 rd   +    140,103 wr)
==3984== LL misses:         140,435  (      7,072 rd   +    133,363 wr)
==3984== LL miss rate:          0.0% (        0.0%     +        0.2%  )