Fixed StreamTweet MatchingRule.ID parsing. (#231)

* Fixed StreamTweet MatchingRule.ID parsing.

* Removed unused usings.

src/LinqToTwitter6/LinqToTwitter.Tests/StreamTests/StreamContentTests.cs

@@ -0,0 +1,47 @@
+using LinqToTwitter.Provider;
+using LinqToTwitter.Tests.Common;
+using Microsoft.VisualStudio.TestTools.UnitTesting;
+using Moq;
+
+namespace LinqToTwitter.Tests.StreamContentTests
+{
+    [TestClass]
+    public class StreamContentTests
+    {
+        Mock<ITwitterExecute> execMock = new();
+
+        public StreamContentTests()
+        {
+            TestCulture.SetCulture();
+        }
+
+        [TestMethod]
+        public void ParseJson_WithTweetEntity_Succeeds()
+        {
+            var content = new StreamContent(execMock.Object, TweetContent);
+
+            (StreamTweet entity, StreamEntityType entityType) = content.ParseJson(TweetContent);
+
+            Assert.IsNotNull(entity);
+            Assert.AreEqual("1439984798332866573", entity.Tweet.ID);
+            Assert.IsTrue(entity.Tweet.Text.StartsWith("Very"));
+            Assert.AreEqual("1324201416731160579", entity.MatchingRules[0].ID);
+            Assert.AreEqual("funny things", entity.MatchingRules[0].Tag);
+            Assert.AreEqual(StreamEntityType.Tweet, entityType);
+        }
+
+        const string TweetContent = @"{
+	""data"": {
+		""id"": ""1439984798332866573"",
+		""text"": ""Very very true, Dev! ..😜😂💕\n#Dev https://t.co/cHFjan""
+	},
+	""matching_rules"": [
+		{
+			""id"": ""1324201416731160579"",
+			""tag"": ""funny things""
+
+        }
+	]
+}";
+    }
+}

src/LinqToTwitter6/LinqToTwitter/Streaming/MatchingRule.cs

@@ -11,7 +11,7 @@ public record MatchingRule
         /// ID for rule
         /// </summary>
         [JsonPropertyName("id")]
-        public ulong ID { get; init; }
+        public string? ID { get; init; }
 
         /// <summary>
         /// Rule tag

src/LinqToTwitter6/LinqToTwitter/Streaming/StreamContent.cs

@@ -20,7 +20,7 @@ public StreamContent(ITwitterExecute exec, string content)
             (Entity, EntityType) = ParseJson(content);
         }
 
-        (StreamTweet? entity, StreamEntityType entityType) ParseJson(string json)
+        public (StreamTweet? entity, StreamEntityType entityType) ParseJson(string json)
         {
             if (string.IsNullOrWhiteSpace(json))
                 return (null, StreamEntityType.Unknown);