ext/intl: Preserve int64 precision in IntlNumberRangeFormatter::format()

[LamentXU123]

Now in IntlNumberRangeFormatter::format(), we use

    icu::Formattable start_formattable(Z_TYPE_P(start) == IS_DOUBLE ? Z_DVAL_P(start) : Z_LVAL_P(start));
    icu::Formattable end_formattable(Z_TYPE_P(end) == IS_DOUBLE ? Z_DVAL_P(end) : Z_LVAL_P(end));

to create ICU Formattable values

The ternary expression doesn't work well because it mix double and zend_long operands, and that will lead to precision lost for obvious reasons. That is

<?php
$formatter = IntlNumberRangeFormatter::createFromSkeleton(
    '',
    'en_US',
    IntlNumberRangeFormatter::COLLAPSE_AUTO,
    IntlNumberRangeFormatter::IDENTITY_FALLBACK_SINGLE_VALUE
);

$formatted = $formatter->format(9007199254740993, 9007199254740993);
var_dump(preg_replace('/[^0-9]/', '', $formatted));
?>

results in

string(16) "9007199254740992"

while it should be

string(16) "9007199254740993"

The feature is newly added in php 8.6-dev so we don't need to write NEWS and UPGRADING entries.