Add examples for `int:range` langlib function

[Nadeeshan96]

Description:

$title See https://lib.ballerina.io/ballerina/lang.int/2201.7.2#range. Examples for this one is missing while others have them. We can add something like https://ballerina.io/downloads/swan-lake-release-notes/swan-lake-2201.5.0#introduction-of-the-intrange-lang-library-function.

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[anuruddhal]

The example should be added from the lang source. Hence transferred.