Adds `--opcode.count=<file>` flag to `evm t8n` that writes per-opcode
execution frequency counts to a JSON file (relative to
`--output.basedir`).
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Co-authored-by: MariusVanDerWijden <m.vanderwijden@live.de>
Co-authored-by: Sina Mahmoodi <itz.s1na@gmail.com>