Add rate limiting, CORS support, custom HTTP method annotations, and HTTP server enhancements

- Introduced rate limiting functionality with multiple algorithms (Token Bucket, Fixed Window, Leaky Bucket, Sliding Window) via `RateLimiter` interface.
- Added CORS handling with `CorsConfig` and `CorsHandler` for flexible origin, headers, and method configuration.
- Implemented support for custom HTTP methods via `PATCH` and `CUSTOM` annotations in `AnnotationScanner`.
- Enhanced `HttpServer` to support builder pattern and optional integrations for CORS and rate limiting.
- Updated `HttpRequestHandler` to incorporate CORS and rate limiting logic.

src/main/java/dev/coph/nextusweb/server/annotation/AnnotationScanner.java

@@ -77,6 +77,12 @@ public final class AnnotationScanner {
 
         DELETE del = m.getAnnotation(DELETE.class);
         if (del != null) return new RouteInfo("DELETE", del.value());
+        
+        PATCH patch = m.getAnnotation(PATCH.class);
+        if (patch != null) return new RouteInfo("PATCH", patch.value());
+        
+        CUSTOM custom = m.getAnnotation(CUSTOM.class);
+        if (custom != null) return new RouteInfo(custom.method(), custom.value());
 
         return null;
     }
@@ -84,12 +90,10 @@ public final class AnnotationScanner {
     private static void validateSignature(Method m) {
         Class<?>[] params = m.getParameterTypes();
         if (params.length != 2 || params[0] != Request.class || params[1] != Response.class) {
-            throw new IllegalArgumentException(
-                    "Handler-Methode " + m + " muss Signatur (Request, Response) haben");
+            throw new IllegalArgumentException("Handler-Methode " + m + " muss Signatur (Request, Response) haben");
         }
         if (m.getReturnType() != void.class) {
-            throw new IllegalArgumentException(
-                    "Handler-Methode " + m + " muss void zurückgeben");
+            throw new IllegalArgumentException("Handler-Methode " + m + " muss void zurückgeben");
         }
     }
 

src/main/java/dev/coph/nextusweb/server/annotation/CUSTOM.java

@@ -0,0 +1,13 @@
+package dev.coph.nextusweb.server.annotation;
+
+import java.lang.annotation.ElementType;
+import java.lang.annotation.Retention;
+import java.lang.annotation.RetentionPolicy;
+import java.lang.annotation.Target;
+
+@Retention(RetentionPolicy.RUNTIME)
+@Target(ElementType.METHOD)
+public @interface CUSTOM {
+    String method();
+    String value();
+}

src/main/java/dev/coph/nextusweb/server/annotation/PATCH.java

@@ -0,0 +1,12 @@
+package dev.coph.nextusweb.server.annotation;
+
+import java.lang.annotation.ElementType;
+import java.lang.annotation.Retention;
+import java.lang.annotation.RetentionPolicy;
+import java.lang.annotation.Target;
+
+@Retention(RetentionPolicy.RUNTIME)
+@Target(ElementType.METHOD)
+public @interface PATCH {
+    String value();
+}