split Number class
update name to LocaleNumber
move TimeTest from Utility to I18n
change name to LocalizedNumber
move Number to I18n
remove LocalizedNumber
update Numberhelper
fix test
move fromReadableSize to parseFileSize
add class_alias for old Cake\Utility\Number
Merge pull request #4458 from antograssiot/3.0-split-number

3.0 split Cake\Utility\Number