Test: wrap some API for aggregation function tests

[ywqzzy]

What problem does this PR solve?

Issue Number: ref #4609

Problem Summary:

What is changed and how it works?

Add executeAggFunctionAndAssert to test agg functions on given column.
Add executeGroupByAndAssert to test group by on given columns.

Check List

Tests

• Unit test
• Integration test
• Manual test (add detailed scripts or steps below)
• No code

Side effects

• Performance regression: Consumes more CPU
• Performance regression: Consumes more Memory
• Breaking backward compatibility

Documentation

• Affects user behaviors
• Contains syntax changes
• Contains variable changes
• Contains experimental features
• Changes MySQL compatibility

Release note

None

[ti-chi-bot]

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[ywqzzy]

/run-all-tests

[ti-chi-bot]

@ywqzzy: PR needs rebase.

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