Proxy DateIntervalFormat.formatDateRange calls to the frameworks

The method is only kept for @UnsupportedAppUsage purpose, and
no libcore / frameworks should use it. We proxy the calls to
the frameworks' implementation for app compat here.

Bug: 258208402
Test: atest libcore.libcore.icu.DateIntervalFormatTest
Change-Id: Idbac705b7d2a0b798141d9463759cb8a734656d0
4 files changed