Deprecate and reject code/gas-observability in EOF

[pdobacz]

OP_CODESIZE, OP_CODECOPY, OP_EXTCODESIZE, OP_EXTCODECOPY, OP_EXTCODEHASH, OP_GAS should be rejected by EOF Megaspec (and by EIP-3540 after updates), so here it is.

Let me know if I missed something here, otherwise I'll fix the tests to account for this.

tests would be set to a tag on this branch: ethereum/tests#1355

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 98.11%. Comparing base (ccc92f1) to head (8d97dec).

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #834      +/-   ##
==========================================
- Coverage   98.12%   98.11%   -0.02%     
==========================================
  Files         118      118              
  Lines       11843    11776      -67     
==========================================
- Hits        11621    11554      -67     
  Misses        222      222              

Flag	Coverage Δ
blockchaintests	61.56% <ø> (ø)
statetests	61.93% <ø> (ø)
statetests-silkpre	23.41% <0.00%> (+0.08%)	⬆️
unittests	96.64% <100.00%> (-0.02%)	⬇️

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Files	Coverage Δ
lib/evmone/baseline_instruction_table.cpp	100.00% <ø> (ø)
test/unittests/eof_validation_test.cpp	100.00% <100.00%> (ø)
test/unittests/evm_eof_test.cpp	100.00% <ø> (ø)