Fix GH-8068: mysqli_fetch_object creates inaccessible properties

When fetching into objects, we need to create object style hash tables,
i.e. where numeric column names are stored as str

Fix GH-8068: mysqli_fetch_object creates inaccessible properties

When fetching into objects, we need to create object style hash tables,
i.e. where numeric column names are stored as string keys instead of
integer keys. Instead of the slightly more efficient alternative to
create the desired hash table in the first place, we go for the more
readable implementation and convert the array style hash table using
`zend_symtable_to_proptable()`.

Co-authored-by: Kamil Tekiela <tekiela246@gmail.com>

Closes GH-8189.

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