ext/intl: Timezone::getIanaID method addition.

returns the primary IANA zone ID from the provided timezone ID.
Most of the time, timezone ID==IANA ID.
available from icu >= 74.

ext/intl: Timezone::getIanaID method addition.

returns the primary IANA zone ID from the provided timezone ID.
Most of the time, timezone ID==IANA ID.
available from icu >= 74.

Close GH-13419.

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