[doc](function) Add stack table function documentation - #4059
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What problem does this PR solve?
Issue Number: close #66687
Related PR: apache/doris#66734
Problem Summary: Document the Spark/Hive-compatible
stack(num_rows, expr1, ..., exprN)table-generating function in both English and Chinese, including row-major output, NULL padding, constant row-count requirements, type validation, and LATERAL VIEW examples.The documentation is current-only because the linked Doris feature PR targets
masterand has not been released in 4.x.Release note
Document the
stacktable function in English and Chinese.Check List (For Author)