feature: Add missing application properties (including Teams) (#1604)

* Add missing application properties

Add IsBotPublic, BotRequiresCodeGrant, and Team properties to IApplication

* To immutable list

* Change list to array

src/Discord.Net.Rest/API/Common/TeamMember.cs

@@ -0,0 +1,17 @@
+#pragma warning disable CS1591
+using Newtonsoft.Json;
+
+namespace Discord.API
+{
+    internal class TeamMember
+    {
+        [JsonProperty("membership_state")]
+        public MembershipState MembershipState { get; set; }
+        [JsonProperty("permissions")]
+        public string[] Permissions { get; set; }
+        [JsonProperty("team_id")]
+        public ulong TeamId { get; set; }
+        [JsonProperty("user")]
+        public User User { get; set; }
+    }
+}