Convert C# code to Java

[scubaninja]

Related to #10

Convert C# code to Java for the mail services API.

• API Routes

  • Add BroadcastRoutes.java to handle broadcast-related routes.
  • Add BulkOperationRoutes.java to handle bulk operations on contacts.
  • Add ContactRoutes.java to handle contact-related routes.
  • Add PublicRoutes.java to handle public routes like signup and unsubscribe.

• Commands

  • Add BulkTagCommand.java to handle bulk tagging of contacts.
  • Add CommandResult.java to represent the result of a command execution.
  • Add ContactOptinCommand.java to handle contact opt-in.
  • Add ContactOptOutCommand.java to handle contact opt-out.
  • Add ContactSignupCommand.java to handle contact signup.
  • Add CreateBroadcast.java to handle the creation of broadcasts.
  • Add LinkClickedCommand.java to handle link click events.

• Data

  • Add DB.java to handle database connections.
  • Add Extensions.java to provide utility methods for database operations.

• Models

  • Add Activity.java to represent an activity.
  • Add Broadcast.java to represent a broadcast.

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