[ForwardPort 2.3] [#14072] Add Zip Pattern for Japan JP

[osrecio]

Add validation for Zip Code in Japan

Description

"1234567" or "123-4567" only can pass the validation. Since 1998, Japanese postoffice only uses 7 digits for zipcode.

Fixed Issues (if relevant)

1. Change zip code validation pattern for Japan #14072: Change zip code validation pattern for Japan

Manual testing scenarios

1. Add one more item into cart
2. Proceed checkout step
3. Choose "Japan" for country
4. Set zip code like "123-4567" or "123-4567"

Contribution checklist

• Pull request has a meaningful description of its purpose
• All commits are accompanied by meaningful commit messages
• All new or changed code is covered with unit/integration tests (if applicable)
• All automated tests passed successfully (all builds on Travis CI are green)