DPL Analysis: add string expression parsing

[aalkin]

• Fix binding node hash handling
• Add tokenizer/parser to handle expressions in string form
• Features supported
  • column binding, requires full string i.e. o2::aod::track::pt
  • arithmetic operations, all functions supported by normal expressions, conditional expressions, parentheses
  • standard math constants (PI, PIHalf, etc.)

It is now possible to do this:

  Configurable<std::string> filterString{"filter-string", "nabs(o2::aod::track::pt) < 10.f", "Filter string expression"};
  Filter f;

  void init(InitContext&)
  {
    f = (std::string)filterString;
  }

  void process(aod::Collision const&, soa::Filtered<aod::Tracks> const& tracks) {}

[github-actions]

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[alibuild]

Error while checking build/O2/fullCI_slc9 for 84e5eae at 2025-07-15 06:45:

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[ktf]

Unused facility. Merging.