message: Remove other mentions in Message
  We already have MessageMentions class, which handles all mentions.
diff: @@ -32,10 +32,7 @@ export class Message extends Base {
  timestamp: string
  editedTimestamp?: string
  tts: boolean
  - mentionEveryone: boolean
  mentions: MessageMentions
  - mentionRoles: string[]
  - mentionChannels?: ChannelMention[]
  attachments: Attachment[]
  embeds: Embed[]
  reactions: MessageReactionsManager
  @@ -63,10 +60,7 @@ export class Message extends Base {
  this.timestamp = data.timestamp
  this.editedTimestamp = data.edited_timestamp
  this.tts = data.tts
  - this.mentionEveryone = data.mention_everyone
  this.mentions = new MessageMentions(this.client, this)
  - this.mentionRoles = data.mention_roles
  - this.mentionChannels = data.mention_channels
  this.attachments = data.attachments
  this.embeds = data.embeds.map((v) => new Embed(v))
  this.reactions = new MessageReactionsManager(this.client, this)
  @@ -88,9 +82,6 @@ export class Message extends Base {
  this.timestamp = data.timestamp ?? this.timestamp
  this.editedTimestamp = data.edited_timestamp ?? this.editedTimestamp
  this.tts = data.tts ?? this.tts
  - this.mentionEveryone = data.mention_everyone ?? this.mentionEveryone
  - this.mentionRoles = data.mention_roles ?? this.mentionRoles
  - this.mentionChannels = data.mention_channels ?? this.mentionChannels
  this.attachments = data.attachments ?? this.attachments
  this.embeds = data.embeds.map((v) => new Embed(v)) ?? this.embeds
  this.nonce = data.nonce ?? this.nonce
  