[Incubator kie issues#2023] Decision Engine: Support new property "value" for types date, date and time, years and months duration, days and time duration

[AthiraHari77]

This PR aims to introduce a new property "value" for types time, date, date and time, years and months duration, days and time duration.
Closes : apache/incubator-kie-issues#2023

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[gitgabrio]

Thanks @AthiraHari77
Could you please write some tests to verify the following sentence from specs:

We write valuedt(d) to represent the number of seconds between d and the epoch. The valuedt
function is one- to-one and so it has an inverse function valuedt -1. E.g., valuedt-1(valuedt(d)) = d. valuedt -1 returns null
rather than a date with a year outside the legal range

?

Thanks!

[Copilot]

Pull Request Overview

This PR adds support for the new value property on FEEL date/time and duration types by calculating and returning the appropriate numeric representation (seconds since epoch or seconds since midnight, or total months).

• Implemented value cases in EvalHelper.getDefinedValue for ChronoPeriod, Duration, LocalTime, OffsetTime, LocalDate, and ZonedDateTime.
• Expanded existing tests and data-driven FEEL tests to cover .value on date, date and time, time, and duration types.
• Added new JUnit tests for LocalTime and ZonedDateTime round-trip via .value.

Reviewed Changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 1 comment.

File	Description
kie-dmn/kie-dmn-feel/src/main/java/org/kie/dmn/feel/util/EvalHelper.java	Added value switch blocks to compute numeric values for periods, durations, and temporal objects
kie-dmn/kie-dmn-feel/src/test/java/org/kie/dmn/feel/util/EvalHelperTest.java	New tests testValueForLocalTime and testValueForZonedDateTime validating value round-trip
kie-dmn/kie-dmn-feel/src/test/java/org/kie/dmn/feel/runtime/FEELDateTimeDurationTest.java	Extended test data table to include .value on various FEEL expressions

Comments suppressed due to low confidence (2)

kie-dmn/kie-dmn-feel/src/test/java/org/kie/dmn/feel/util/EvalHelperTest.java:82

• Add a unit test for OffsetTime .value (for example time("13:20:00+02:00").value) to verify that offset times produce the expected seconds-since-midnight result.

}

kie-dmn/kie-dmn-feel/src/main/java/org/kie/dmn/feel/util/EvalHelper.java:188

• Using pattern matching for instanceof (e.g., instanceof LocalDate date) requires Java 16 or higher. If this project targets Java 11, switch to the traditional pattern (if (current instanceof LocalDate) { LocalDate date = (LocalDate) current; ... }) for broader compatibility.

                    } else if (current instanceof LocalDate date) {

[yesamer]

Thank you @AthiraHari77