add japanese gender first name

[ise-tang]

irb(main):001:0> Faker::Name.name
=> "西村 匠" # correct japanese name
irb(main):002:0> Faker::Name.male_first_name
=> "颯太" # correct japanese male name
irb(main):003:0> Faker::Name.female_first_name
=> "陽菜" # correct japanse female name
irb(main):004:0> Faker::Name.first_name
=> "美咲"

[psibi]

@issei126 Thanks for the MR, but this requires minor changes.

[psibi]

Thanks!