internal/ethapi: avoid recreating JavaScript tracer wrappers #15552
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During tracing, 26% of the time is currently spent in wrapping an opcode into a JavaScript object for otto. But there's no reason to wrap each opcode one by one, rather we can reuse the same JavaScript wrapper, just replace the opcode inside it.
The remainder of the PR is just removing some assignments to make the code a bit cleaner and more efficient, although I don't think there are to significant performance improvements there.