graphql: Add 'as' option to argument method signature

[aruma256]

Add 'as' option to argument method signature

Reference:

• https://github.com/rmosolgo/graphql-ruby/blob/v1.12.0/lib/graphql/schema/member/has_arguments.rb#L16-L18
• https://github.com/rmosolgo/graphql-ruby/blob/v1.12.0/lib/graphql/schema/argument.rb#L47-L55

[github-actions]

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[aruma256]

/merge