[Backport 2.19-dev] Support time modifiers in search command (#4224)

[yuancu]

Description

Backport #4224 to 2.19-dev

Commit Messages

• Implement absolute time range in search command

Unit test search with absolute time range

Rephrase timeRange and timeModifier

Switch to earliest and latest udf

Add a convert util

Verify time correctness during coversion

Fix quarter parsing bugs

Fix week snap parsing

Remove old implementation that translates time modifier to time filter

• Fix anomalyzed test & add a todo for an ignored test

• Support now() in time range

• Fix time modifier explain ITs

• Support unixtimestamp (second) as a time modifier value

• Update docs for search command with time modifiers

• Test accessing fields with name earliest and latest in search command

• Update doctest in condition.rst due to the update in the implementation of earliest and latest conditions

• Update PPLQueryDataAnonymizerTest.java

• Update explain ITs to use yaml plan files

• Update a link to OpenSearch exists

• Support using timesnaps without quotes

• Add a unit test for direct format

• additionally rename parseRelativeTime to resolveTimeModifier

• Add support to ISO 8601 date format to time modifier, as it is now widely supported in PPL

• Update syntax by reusing SPANLENGTH definition

• Update explain IT for search with time modifier

• Add integration tests for time modifiers

• Parse timestamp string with multiple parsers in a loop

• Remove opensearch test dependency from core module

• Fix unit tests

• Minor updates to explain limitations in search doc

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(cherry picked from commit e468513)

Related Issues

#4135

Check List

• New functionality includes testing.
• New functionality has been documented.
• New functionality has javadoc added.
• New functionality has a user manual doc added.
• New PPL command checklist all confirmed.
• API changes companion pull request created.
• Commits are signed per the DCO using --signoff or -s.
• Public documentation issue/PR created.

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