refactor(types): unify handler and middleware definitions

- Consolidates `Handler` and `Middleware` types under `Types` module
- Replaces `IHandler` and `IMiddleware` interfaces with typed functions
- Simplifies imports and improves code organization
- Enhances debugging with named handlers and middlewares

src/Interfaces/mod.ts

@@ -1,14 +1,10 @@
 // deno-coverage-ignore-file
 
 export type { IContext } from './IContext.ts';
-export { isHandler } from './IHandler.ts';
-export type { IHandler } from './IHandler.ts';
 export type { IHttpErrorHandlers } from './IHttpErrorHandlers.ts';
 export type { IHttpKernel } from './IHttpKernel.ts';
 export type { IHttpKernelConfig } from './IHttpKernelConfig.ts';
 export type { IInternalRoute } from './IInternalRoute.ts';
-export { isMiddleware } from './IMiddleware.ts';
-export type { IMiddleware } from './IMiddleware.ts';
 export type { IRouteBuilder, IRouteBuilderFactory } from './IRouteBuilder.ts';
 export {
     isDynamicRouteDefinition,