Add bytes/bytearray benchmarks to translate_bench.py

Extend the translate benchmark script to cover bytes and bytearray
in addition to str. New features:

- bytes.translate() benchmarks: full rotation, nibble swap, identity,
  ASCII data, and deletion cases
- bytearray.translate() benchmarks: full rotation and deletion cases
- --str-only and --bytes-only flags to run specific benchmarks
- Updated correctness tests for bytes/bytearray

https://claude.ai/code/session_0142fPYhFLFes4W9Tp6C3BhU

Author: claude