SRombauts / SQLiteCpp / 28825900628

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Range for loop for statements (#545)

Closes #181

Adds a nested `RowIterator` class to `Statement` that enables
range-based for loops over query results:

```cpp
SQLite::Statement query(db, "SELECT id, name FROM test");
for (SQLite::Statement& row : query)
{
    std::cout << row.getColumn(0).getInt() << "\n";
}
```

Notes:
- `begin()` calls `reset()` automatically, so re-iterating the same
Statement always starts from the beginning
- Bindings set before the loop are preserved across `reset()`
- Empty result sets are handled correctly (loop body never executes)
- `RowIterator` satisfies `std::input_iterator_tag` with full iterator
traits

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