Add UTC_DATE, UTC_TIME, UTC_TIMESTAMP

[MitchellGale]

Description

Adds functionality for UTC_TIME, UTC_DATE and UTC_TIMESTAMP functions.

UTC_TIME - Returns current UTC time in HH:mm:ss time format.
UTC_DATE - Returns current UTC date in uuuu-MM-dd date format.
UTC_TIMESTAMP - Returns current UTC Date/time in uuuu-MM-dd HH:mm:ss date format.

Example use cases:

opensearchsql> SELECT utc_timestamp(), utc_date(), utc_time();                                                                                                                     
fetched rows / total rows = 1/1
+---------------------+--------------+--------------+
| utc_timestamp()     | utc_date()   | utc_time()   |
|---------------------+--------------+--------------|
| 2022-12-09 19:40:54 | 2022-12-09   | 19:40:54     |
+---------------------+--------------+--------------+

Issues Resolved

opensearch-project#722

Check List

• New functionality includes testing.
  • All tests pass, including unit test, integration test and doctest
• New functionality has been documented.
  • New functionality has javadoc added
  • New functionality has user manual doc added
• Commits are signed per the DCO using --signoff

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.
For more information on following Developer Certificate of Origin and signing off your commits, please check here.

[codecov]

Codecov Report

Merging #187 (3648144) into Integ-UTC_DATE_TIME_TIMESTAMP_LIKENOW (354e843) will decrease coverage by 35.54%.
The diff coverage is n/a.

@@                             Coverage Diff                              @@
##             Integ-UTC_DATE_TIME_TIMESTAMP_LIKENOW     #187       +/-   ##
============================================================================
- Coverage                                    98.31%   62.76%   -35.55%     
============================================================================
  Files                                          348       10      -338     
  Lines                                         8707      658     -8049     
  Branches                                       555      119      -436     
============================================================================
- Hits                                          8560      413     -8147     
- Misses                                         142      192       +50     
- Partials                                         5       53       +48     

Flag	Coverage Δ
query-workbench	62.76% <ø> (?)
sql-engine	?

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Impacted Files	Coverage Δ
...c/main/java/org/opensearch/sql/expression/DSL.java
...arch/sql/expression/datetime/DateTimeFunction.java
...h/sql/expression/function/BuiltinFunctionName.java
.../planner/logical/rules/MergeFilterAndRelation.java
...n/java/org/opensearch/sql/utils/DateTimeUtils.java
...g/opensearch/sql/planner/logical/LogicalLimit.java
.../sql/planner/physical/PhysicalPlanNodeVisitor.java
...ch/sql/opensearch/client/OpenSearchNodeClient.java
...rch/sql/opensearch/response/agg/TopHitsParser.java
...search/sql/expression/datetime/CalendarLookup.java
... and 348 more

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[Yury-Fridlyand]

Please, update ppl/src/test/java/org/opensearch/sql/ppl/antlr/NowLikeFunctionParserTest.java and sql/src/test/java/org/opensearch/sql/sql/parser/AstNowLikeFunctionTest.java too

[MaxKsyunz]

A couple minor style comments but everything else LGTM.

[MaxKsyunz]

Suggested change

	-> DateTimeFunction.exprUtcTime(functionProperties), TIME));
	->exprUtcTime(functionProperties), TIME));

Doesn't this comment apply here as well?

[MaxKsyunz]

Suggested change

	-> DateTimeFunction.exprUtcTimeStamp(functionProperties), DATETIME));
	->exprUtcTimeStamp(functionProperties), DATETIME));

Doesn't this comment apply here as well?