[SPARK-27974][SQL] Support ANSI Aggregate Function: array_agg

[beliefer]

What changes were proposed in this pull request?

This PR used to support ANSI aggregate Function: array_agg.

The mainstream database supports array_agg show below:
Presto
https://prestodb.io/docs/current/functions/aggregate.html
Teradata
https://docs.teradata.com/r/kmuOwjp1zEYg98JsB8fu_A/Xffi_w_BZeSoaXg6Fd76Qw
Snowflake
https://docs.snowflake.com/en/sql-reference/functions/array_agg.html
Oracle
https://docs.oracle.com/en/database/oracle/oracle-database/19/sqlrf/JSON_ARRAYAGG.html#GUID-6D56077D-78DE-4CC0-9498-225DDC42E054
H2
http://www.h2database.com/html/functions-aggregate.html#array_agg
Postgresql
https://www.postgresql.org/docs/8.4/functions-aggregate.html
Maria
https://mariadb.com/kb/en/json_arrayagg/
Intersystems
https://docs.intersystems.com/latest/csp/docbook/DocBook.UI.Page.cls?KEY=RSQL_jsonarrayagg
MySQL
https://www.mysqltutorial.org/mysql-aggregate-functions.aspx
Druid
https://druid.apache.org/docs/latest/querying/sql.html#aggregation-functions

Why are the changes needed?

array_agg is very useful.

Does this PR introduce any user-facing change?

'Yes'. New feature.

How was this patch tested?

New tests.

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Test build #146085 has finished for PR 34866 at commit 584418c.

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• This patch adds no public classes.

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Test build #146086 has finished for PR 34866 at commit 5a87b37.

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• This patch merges cleanly.
• This patch adds no public classes.

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Test build #146089 has finished for PR 34866 at commit 7dd4c44.

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• This patch adds no public classes.

[beliefer]

ping @MaxGekk @gengliangwang cc @cloud-fan

[cloud-fan]

I would write only one test with GROUP BY, which has duplicated values

(1,4),(2,3),(1,4),(2,4)

[beliefer]

OK

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Test build #146290 has finished for PR 34866 at commit a895ad7.

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• This patch merges cleanly.
• This patch adds no public classes.

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Test build #146305 has finished for PR 34866 at commit 590279c.

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• This patch merges cleanly.
• This patch adds no public classes.

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Test build #146314 has finished for PR 34866 at commit 990472a.

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• This patch adds no public classes.

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[cloud-fan]

thanks, merging to master!

[beliefer]

@cloud-fan Thank you very much.

[SparkQA]

Test build #146323 has finished for PR 34866 at commit bbba0d0.

• This patch passes all tests.
• This patch merges cleanly.
• This patch adds no public classes.

[cloud-fan]

Does this PR introduce any user-facing change?
'No'. New feature.

Please be more careful when writing PR descriptions. How can this be not user-facing?