Support complete `distinct` usage for aggregate expressions

[WinkerDu]

Is your feature request related to a problem or challenge? Please describe what you are trying to do. Here are multiple aggregate expressions have not support distinct usage yet. Though optimizer SingleDistinctToGroupBy (#1315) supports single distinct usage, there are more SQL scenes have not been covered, like

SELECT AVG(c1), SUM(DISTINCT c2) FROM test

I would like to take effort to work on the following tickets to complete distinct usage for aggregate expressions

• [x] #2405
• [ ] #2407
• [ ] #2408
• [ ] #2409
• [ ] #2410
• [x] #2411 (more to be added later)

Describe the solution you'd like Adds specific aggregate expression support, like expressions::DistinctSum for sum(distinct)

Describe alternatives you've considered No.

Additional context No.

[WinkerDu]

@andygrove @alamb can you please assign this issue to me? Thank you ❤️

[alamb]

@andygrove @alamb can you please assign this issue to me? Thank you ❤️

Done -- thanks @WinkerDu