[Feat] Role-reaction

[anhgelus]

Add role-reaction system with Discord's button.

This system must be edited with the new command general /role-reaction.

• /role-reaction create - Create a new role-reaction interface
• /role-reaction edit - Edit a role-reaction
• /role-reaction show - Show every role-reaction interface
• /role-reaction delete - Delete a role-reaction interface

Creates a new type RoleReactionInterface and RoleReaction:

type RoleReactionInterface struct {
	gorm.Model
	GuildID       string
	ChannelID     string
	MessageID     string
	RoleReactions []RoleReaction
}

type RoleReaction struct {
	gorm.Model
	RoleReactionInterfaceID uint
	Content                 string
	Emoji                   string
}

These new types must be compatible with the interface gokord.DataBase.

RoleReactionInterface must have a method called GenMessage which generates the message to send.