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feat: add .members() iterator adapter for range-based for loops (#288) (#1679)

* feat: add .members() iterator adapter for range-based for loops (#288)

This adds a zero-allocation iterator adapter to `Json::Value` that enables idiomatic range-based for loops over object members. This allows iterating over key-value pairs without allocating a vector of keys via `getMemberNames()`, and cleanly supports C++17 structured bindings (e.g. `for (const auto& [name, val] : obj.members())`).

Fixes #288

* run ninja format

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