[SPARK-37623][SQL] Support ANSI Aggregate Function: regr_intercept

[beliefer]

What changes were proposed in this pull request?

REGR_INTERCEPT is an ANSI aggregate functions

Syntax: REGR_INTERCEPT(y, x)
Arguments:

• y:The dependent variable. This must be an expression that can be evaluated to a numeric type.
• x:The independent variable. This must be an expression that can be evaluated to a numeric type.

Examples:
select k, regr_intercept(v, v2) from aggr group by k;

k	regr_intercept(v, v2)
1	[NULL]
2	1.154734411

The algorithm refers https://en.wikipedia.org/wiki/Algorithms_for_calculating_variance

The mainstream database supports regr_intercept show below:
Teradata
https://docs.teradata.com/r/kmuOwjp1zEYg98JsB8fu_A/MpkZBV~MSTZ~I84I~ezxNg
Snowflake
https://docs.snowflake.com/en/sql-reference/functions/regr_intercept.html
Oracle
https://docs.oracle.com/en/database/oracle/oracle-database/19/sqlrf/REGR_-Linear-Regression-Functions.html#GUID-A675B68F-2A88-4843-BE2C-FCDE9C65F9A9
DB2
https://www.ibm.com/docs/en/db2/11.5?topic=af-regression-functions-regr-avgx-regr-avgy-regr-count
H2
http://www.h2database.com/html/functions-aggregate.html#regr_intercept
Postgresql
https://www.postgresql.org/docs/8.4/functions-aggregate.html
Sybase
https://infocenter.sybase.com/help/index.jsp?topic=/com.sybase.help.sqlanywhere.12.0.0/dbreference/regr-intercept-function.html
Presto
https://prestodb.io/docs/current/functions/aggregate.html
Exasol
https://docs.exasol.com/sql_references/functions/alphabeticallistfunctions/regr_function.htm

Why are the changes needed?

REGR_INTERCEPT is very useful.

Does this PR introduce any user-facing change?

'No'. New feature.

How was this patch tested?

New tests.

[beliefer]

ping @MaxGekk cc @cloud-fan

[MaxGekk]

+1, LGTM. Merging to master.
Thank you, @beliefer and @cloud-fan for review.

[beliefer]

@MaxGekk @cloud-fan Thank you for review.