There is no struct SparseArrayEntry{,Wrapper}

There is no struct SparseArrayEntry{,Wrapper}

there is only a

typedef struct {
   ...
} SparseArrayEntry;

This introduces a 'struct SparseArrayEntryTag' and converts all previously
incorrect uses of struct SparseArrayEntry to SparseArrayEntry, ie remove
useless casts.

And do the same with struct SparseArrayEntryWrapper.

Closes SF#1889481