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We need to support label key containers other than std::list<std::string in the MultiDimension APIs…

We need to support label key containers other than std::list<std::string in the MultiDimension APIs…: a task in LegoFlow-SWE (Harbor dataset). Observed behaviour cpp bvar::MultiDimension<bvar::Adder<int g count("count", {"idc", "method", "status"});

The task

**Observed behaviour** ```cpp bvar::MultiDimension<bvar::Adder<int>> g_count("count", {"idc", "method", "status"});

Part of Lego-X/LegoFlow-SWE.