Add iterator type aliases to ParamIterator

[Copilot]

ParamIterator was missing the required type aliases (iterator_category, value_type, difference_type, pointer, reference) that enable C++ standard library algorithms to work with it via std::iterator_traits.

Changes

• Param.h: Added five iterator type aliases to ParamIterator class
  • iterator_category = std::forward_iterator_tag (supports increment only)
  • value_type = Param::ParamEntry
  • difference_type = std::ptrdiff_t
  • pointer = const Param::ParamEntry*
  • reference = const Param::ParamEntry&
• Includes: Added <iterator> and <cstddef> headers
• Tests: Added unit tests verifying type traits work correctly with std::iterator_traits

Usage

ParamIterator now works with STL algorithms:

Param param;
// ... populate param ...

// Now works:
auto count = std::distance(param.begin(), param.end());
auto it = std::find_if(param.begin(), param.end(), 
    [](const auto& entry) { return entry.value.type() == ParamValue::INT_VALUE; });

Pattern follows existing OpenMS iterators like IntensityIteratorWrapper.

Original prompt

---

This section details on the original issue you should resolve

<issue_title>Make ParamIterator a real iterator</issue_title>
<issue_description>https://github.com/OpenMS/OpenMS/blob/develop/src/openms/include/OpenMS/DATASTRUCTURES/Param.h#L167

iterator tags etc. are missing</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes Make ParamIterator a real iterator #7251

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[timosachsenberg]

looks good... let's wait unil mac passes