[FEATURE] More concise and clear way of declaring types in main core / container

[Jerry-Jinfeng-Guo]

In the Container implementation, there now exist three types: Storagable, Gettable and ExtraRetrievable. However, the functions that are defined around are not clear in the way what types are actually expected and what the result is actually about. In this issue, changes are proposed to rename in certain locations when it comes to templated types.

For example, when getting indices on Storagable, it should be clear that this in on the level of base class and derived classes on Gettable types. E.g., consider the following function signatures:
rename

template <supported_type_c<GettableTypes...> Gettable> Idx2D get_idx_by_id(ID id) const

to

template <supported_type_c<GettableTypes...> Gettable> Idx2D get_detail_idx_by_id(ID id) const

or

template <supported_type_c<GettableTypes...> Gettable> Idx2D get_secondary_idx_by_id(ID id) const

and

template <supported_type_c<StorageableTypes...> Storageable> Idx get_group_idx() const

to

template <supported_type_c<StorageableTypes...> Storageable> Idx get_abstract_group_idx() const

or

template <supported_type_c<StorageableTypes...> Storageable> Idx get_primary_group_idx() const

etc..