Work with DateInterval instances in util.TimeSpan

[thekid]

This pull request adds the ability to use the following as constructor arguments to util.TimeSpan:

• Integers and decimals representing seconds as previously supported
• ISO 8601 duration strings, e.g. "PT2H5M" for 2 hours and 5 minutes
• Date strings, e.g. "1 day", as supported by DateInterval::createFromDateString()

Unsupported types or malformed strings will result in a lang.IllegalArgumentException.

use util\TimeSpan;

$span= new TimeSpan('PT2H5M');
$span->format('%y hours and %j minutes'); // 2 hours and 5 minutes

[thekid]

Released in https://github.com/xp-framework/core/releases/tag/v12.7.0