[ASTERIXDB-2476][FUN] Support array slicing in SQL++ - user model changes: yes - storage format changes: no - interface changes: no
Details: - Added array_slice function. 2 functions were added, one that accepts 2 arguments and the other accepts 3 arguments. The arguments are (list, start, end) respectively. - Added array_slice function test cases. - Array slice syntax and documentation will be added in subsequent changes.