Tracking: improve aggreagation fuzzer

[Rachelint]

Is your feature request related to a problem or challenge?

I found aggregation fuzzer are still hard to use when I act as an user currently.
Some points I noticed can be improved:

1. Aggregation function generation

Now it is still hard/possible to generate sql having multiple aggregated functions like:

SELECT count(string), sum(number) FROM xxx GROUP BY xxx;

It is due to aggregate_function and aggregate_arguments are set respectively. if we set mutiple aggregate_functions, columns in the respectly set aggregate_arguments may be not supported in some of the aggregate_functions.
For example,

If we set:
aggregate_arguments: [string, primitive]
aggregate_function: [sum, count]

Then wrong generated sql possible to be generated:
SELECT sum(string) FROM t GROUP BY xxx

2. Group by columns ordering

Noticed by @jayzhan211 , it is hard to control the ordering of group by columns right now.
#15851 (comment)

Describe the solution you'd like

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Describe alternatives you've considered

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Additional context

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