feat(GuildMember): add guild avatars (#5696)

Co-authored-by: Sugden <28943913+NotSugden@users.noreply.github.com>
Co-authored-by: Shubham Parihar <shubhamparihar391@gmail.com>
Co-authored-by: GoldenAngel <50855202+GoldenAngel2@users.noreply.github.com>

typings/index.d.ts

@@ -873,6 +873,7 @@ export class GuildEmoji extends BaseGuildEmoji {
 
 export class GuildMember extends PartialTextBasedChannel(Base) {
   public constructor(client: Client, data: RawGuildMemberData, guild: Guild);
+  public avatar: string | null;
   public readonly bannable: boolean;
   public deleted: boolean;
   public readonly displayColor: number;
@@ -894,10 +895,12 @@ export class GuildMember extends PartialTextBasedChannel(Base) {
   public readonly roles: GuildMemberRoleManager;
   public user: User;
   public readonly voice: VoiceState;
+  public avatarURL(options?: ImageURLOptions): string | null;
   public ban(options?: BanOptions): Promise<GuildMember>;
   public fetch(force?: boolean): Promise<GuildMember>;
   public createDM(force?: boolean): Promise<DMChannel>;
   public deleteDM(): Promise<DMChannel>;
+  public displayAvatarURL(options?: ImageURLOptions): string;
   public edit(data: GuildMemberEditData, reason?: string): Promise<GuildMember>;
   public kick(reason?: string): Promise<GuildMember>;
   public permissionsIn(channel: GuildChannelResolvable): Readonly<Permissions>;
@@ -2297,6 +2300,14 @@ export const Constants: {
         size: AllowedImageSize,
         dynamic: boolean,
       ) => string;
+      GuildMemberAvatar: (
+        guildId: Snowflake,
+        memberId: Snowflake,
+        hash: string,
+        format?: DynamicImageFormat,
+        size?: AllowedImageSize,
+        dynamic?: boolean,
+      ) => string;
       Icon: (
         guildId: Snowflake,
         hash: string,