Support new Japanese calendar eras (#18209)

Japan is going to introduce the new era next year 2019, this new era will be added to the Japanese calendar. This new era would affect anyone converting, formatting or parsing dates using the Japanese calendar.
Users who formatted future dates before introducing the new era and then try to parse these dates after introducing the new era will fail and get parsing exception. The reason is the year number will not be valid in the old era anymore because the new era set a year limit to the old era.

Here is an example:

Format a date like "平成 32年2月1日" which saying year 32 in the era "平成". after we introduce the new era, the old era "平成" will be limited up to and including year 31 so year 32 is exceeding the era end.

The fix is to allow the parser succeeds with such dates and have a config switch which can be used to for anyone want the old behavior.

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