Change from `tuple` to `struct` for storing metadata of stored collections

Currently we use a `std::tuple` to store some metatdata related to collections:

https://github.com/AIDASoft/podio/blob/5afdefdd233bd6b53f51d38bceffae600ae41409/include/podio/utilities/RootHelpers.h#L18-L21

This makes it hard to read via julia and also from a maintainability point of view it would be nicer, if this was something like

```cpp
struct CollectionWriteInfo {
  uint32_t collectionID;
  std::string dataType;
  bool isSubset;
  unsigned int schemaVersion;
};
```

@peremato I suppose something along these lines should work?


	// A collection of additional information that describes the collection: the
	// collectionID, the collection (data) type, whether it is a subset
	// collection, and its schema version
	using CollectionWriteInfoT = std::tuple<uint32_t, std::string, bool, unsigned int>;

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Change from `tuple` to `struct` for storing metadata of stored collections #705

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Change from tuple to struct for storing metadata of stored collections #705

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Change from `tuple` to `struct` for storing metadata of stored collections #705