Add separate test files for property attributes of Intl properties

harness/testBuiltInObject.js

test/intl402/Collator/10.1_L15.js

test/intl402/Collator/prop-desc.js

test/intl402/Collator/prototype/10.3_L15.js

test/intl402/Collator/prototype/compare/10.3.2_1_a_L15.js

test/intl402/Collator/prototype/compare/10.3.2_L15.js

test/intl402/Collator/prototype/compare/prop-desc.js

test/intl402/Collator/prototype/constructor/prop-desc.js

.../intl402/Collator/prototype/resolvedOptions/10.3.3_L15.js

test/intl402/Collator/prototype/resolvedOptions/prop-desc.js

test/intl402/Collator/supportedLocalesOf/10.2.2_L15.js

test/intl402/Collator/supportedLocalesOf/prop-desc.js

test/intl402/Date/prototype/toLocaleDateString/13.3.2_L15.js

test/intl402/Date/prototype/toLocaleString/13.3.1_L15.js

test/intl402/Date/prototype/toLocaleTimeString/13.3.3_L15.js

test/intl402/DateTimeFormat/12.1_L15.js

test/intl402/DateTimeFormat/prop-desc.js

test/intl402/DateTimeFormat/prototype/12.3_L15.js

...intl402/DateTimeFormat/prototype/constructor/prop-desc.js

...intl402/DateTimeFormat/prototype/format/12.3.2_1_a_L15.js