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[Feature] add mann_whitney_u_test aggregate function

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## Why I'm doing: ## What I'm doing: feat #45513 ## What type of PR is this: - [ ] BugFix - [x] Feature - [ ] Enhancement - [...

support mann_whitney_u_test aggregate function

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- [x] https://github.com/StarRocks/starrocks/pull/45510 ## Feature request **Is your feature request related to a problem? Please describe.** Please refer to [Whitney_U_test-wikipedia](https://en.wikipedia.org/wiki/Mann%E2%80%93Whitney_U_test). **Describe the solution you'd like** The Mann-Whitney U test is...