MultiSelect implement SelectItem disabled

[NoFr1ends]

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[ ] bug report
[x] feature request
[ ] support request => Please do not submit support request here, instead see https://forum.primefaces.org/viewforum.php?f=57

Current behavior
Currently there is no option to disable an option in a MultiSelect element.

Expected behavior
It should be possible to set the disabled with the common SelectItem API.