fix(levm): add memory alignment in extcodecopy #1263
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Motivation
Fixes an implementation error found by FuzzingLabs in extcodecopy opcode implementation.
Description
Previously, in EXTCODECOPY the allocated memory size was not aligned to a multiple of 32 bytes, and was added in, for example, 12 bytes (should increase in blocks of 32). Now the increases are done in groups of 32.
Closes #1251