MDEV-10426 ANY_VALUE function#5151
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This pull request implements the ANY_VALUE() function by adding it to the client commands, defining the Item_func_any_value class (inheriting from Item_func_coalesce), and registering it in the function registry. Feedback on the changes points out a critical issue: because Item_func_any_value inherits from Item_func_coalesce, it will still trigger ONLY_FULL_GROUP_BY errors unless check_cols_in_group_by() is overridden to return false directly.
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MDEV-10426: Add support for the MySQL
ANY_VALUE()function (SQL:2023 feature T626).