Add earliest and latest in aggregation and window function

[xinyual]

Description

This pr add latest/earliest as two aggregation function, it will calculate the earliest/latest time for the time related column. Since we support time related type as string (timestamp/time/date), currently we directly reuse max/min to do it.

Related Issues

Resolves #[Issue number to be closed when this PR is merged]
#3639

Check List

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

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[penghuo]

• update docs please.
• what is expectation of earliest and latest? Do we support it in where command?

[dai-chen]

In SPL doc, these functions are applied to _raw field, but in our impl it's just an alias of min/max?

[xinyual]

• update docs please.
• what is expectation of earliest and latest? Do we support it in where command?

Add the doc.
This PR only add them as the aggregation. Will raise another PR as the boolean function.

[xinyual]

In SPL doc, these functions are applied to _raw field, but in our impl it's just an alias of min/max?

In aggregation, they just calculate the latest/earliest time. Since we implement time related column as string, we can directly reuse min/max for them. Also in SPL, _raw is regarded as a string field.

[penghuo]

Please fix IT

[xinyual]

Please fix IT

Already fix it by fixing the doc.

[xinyual]

@penghuo @dai-chen I also implement earliest/latest as two condition function. Please review it.

[LantaoJin]

please make sure the cases you added could pass in doc-test with calcite enabled in local then change the os> to PPL>

[LantaoJin]

I am afraid the current implementation may be wrong, the current implementation treat the earliest and latest as window function with default window frame. IMO, the behavior is odd. Please check again if they require to use other window frame instead default.