feat(event-handler): add decorator functioanlity for error handlers

[svozza]

Summary

This is the final PR for the error handling system for event handler and adds decorator functionality as per the RFC in #3500:

class Lambda {
  @app.errorHandler(ZodError)
  public async handleInvalidRequest(error: ZodError) {    
    return {
      statusCode: 400,
      error: 'BadRequest',
      message: error.message
    }
  }

  @app.get('/todos/:todoId')
  public async getTodoById({ params }) {
    const { todoId } = params;
    const todos = await fetch(`https://jsonplaceholder.typicode.com/todos/${todoId}`);
    
    return { todos: await todos.json() }
  }
}

export const handler = async (event, context) =>
  app.resolve(event, context);

Changes

• Updated the errorHandler, notFound, methodNotAllowed methods to act as decorators
• Ensured that this is preserved when handleError is called.
• Unit tests

Issue number: closes #4141

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[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

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