Fix sonar issues

Author: Kaliumhexacyanoferrat

Engine/Protocol/Parser/Conversion/MethodConverter.cs

@@ -5,7 +5,7 @@
 namespace GenHTTP.Engine.Protocol.Parser.Conversion
 {
 
-    internal class MethodConverter
+    internal static class MethodConverter
     {
 
         internal static FlexibleRequestMethod ToRequestMethod(ReadOnlySequence<byte> value)

Engine/Protocol/Parser/RequestScanner.cs

@@ -48,7 +48,7 @@ internal async PooledValueTask<RequestToken> Next(RequestBuffer buffer, bool for
             }
 
             // did not recognize any tokens, probably due to missing input data
-            if (forceRead == false)
+            if (!forceRead)
             {
                 return await Next(buffer, forceRead: true);
             }

Engine/Protocol/Parser/ScannerMode.cs

@@ -1,10 +1,4 @@
-using System;
-using System.Collections.Generic;
-using System.Linq;
-using System.Text;
-using System.Threading.Tasks;
-
-namespace GenHTTP.Engine.Protocol.Parser
+namespace GenHTTP.Engine.Protocol.Parser
 {
 
     internal enum ScannerMode