[DataManager] added functionalities to the DataManager famillies.
class concerned : xAttachedDataManagerAOMDGeneric xGeneralUnorderedMapDataManager xUnorderedMapDataManager - added public type alias : using value_type = DATATYPE; using key_type = KEYTYPE; Rational : usefull for generic programming with datamanagers. - added member function contains : bool contains(const KEYTYPE &key) const; return true if the key is in the datamanager. rational : when need to know if a key exist in the data manager, calling contains is easier and faster than call getData(key) and check if null. The name contains is standard in stl associative container starting at c++20. It complement the old count. - added member function rangeKey : xtool::xRange<c_iterKey_t> rangeKey() const; return the range of key in the container. rational : avoid calling beginKey() and endKey() in some contexts. Make Datamanagers in sync with other containers of Xfiles.