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perf(json): write escaped byte hex digits directly in BytesView::to_json

Moving ToJson into json (ebd1522cc) replaced the call to the private
BytesView::escape_to with an inline loop that calls `byte.to_hex()`,
allocating a string for every escaped byte. Write the two hex digits
straight into the StringBuilder instead, as escape_to does.

bench Bytes ToJson binary n=100000:
  native  2.08 ms -> 503 us
  wasm-gc 2.01 ms -> 1.08 ms

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

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