refactor: remove static methods from generic type and move to non-generic static class.

tests/StevanFreeborn.Results.Tests/ErrorTests.cs

@@ -6,6 +6,7 @@ public class ErrorTests
   public async Task Constructor_WhenCalled_ItShouldSetCode()
   {
     var error = new Error("code", "message");
+
     await Assert.That(error.Code).IsEqualTo("code");
   }
 
@@ -13,6 +14,7 @@ public class ErrorTests
   public async Task Constructor_WhenCalled_ItShouldSetMessage()
   {
     var error = new Error("code", "message");
+
     await Assert.That(error.Message).IsEqualTo("message");
   }
 
@@ -21,6 +23,7 @@ public class ErrorTests
   {
     var metadata = new Dictionary<string, object> { { "key", "value" } };
     var error = new Error("code", "message", metadata);
+
     await Assert.That(error.Metadata!.Count).IsEqualTo(1);
     await Assert.That(error.Metadata["key"]).IsEqualTo("value");
   }
@@ -29,7 +32,8 @@ public class ErrorTests
   public async Task Constructor_WhenCalledWithNullMetadata_ItShouldSetMetadataToNull()
   {
     var error = new Error("code", "message", null);
-    await Assert.That(error.Metadata!).IsNull();
+
+    await Assert.That(error.Metadata).IsNull();
   }
 
   [Test]
@@ -37,6 +41,7 @@ public class ErrorTests
   {
     var error1 = new Error("code", "message");
     var error2 = new Error("code", "message");
+
     await Assert.That(error1).IsEqualTo(error2);
   }
 
@@ -45,6 +50,7 @@ public class ErrorTests
   {
     var error1 = new Error("code1", "message");
     var error2 = new Error("code2", "message");
+
     await Assert.That(error1 == error2).IsFalse();
   }
 
@@ -52,6 +58,7 @@ public class ErrorTests
   public async Task Error_WhenCreated_ItShouldImplementIError()
   {
     var error = new Error("code", "message");
+
     await Assert.That(error).IsAssignableTo<IError>();
   }
 }