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refactor(json): template the ParseError/Json/JsonPath Show impls

- `ParseError` variants and the deprecated `Json` `Show` render through
  `<+` templates; the conditional `Number(...)` arm delegates to a local
  writer function so its delimiters stay paired in one template
- `JsonPath` JSON Pointer rendering streams each path step through a
  template with `\{cb => ...}` writer holes

Inline-writer holes use `\{cb => ...}` so delimiters stay paired and the
templates stay readable.

Co-Authored-By: SeekMoon <seekmoon@moonbitlang.com>

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