Decorators: Added validate_params decorator

Walkthrough

The updates introduce a new Flask route /create-user with enhanced input parameter validation using a custom validate_params decorator. This decorator, added to the flask_utils module, ensures that the user creation request parameters are correctly typed and optionally allows empty values. Additionally, comprehensive tests have been included to validate the decorator's functionality across various scenarios.

Changes

File Path	Change Summary
`README.md`	Added a new Flask route `/create-user` with parameter validation using `validate_params`.
`flask_utils/__init__.py`	Updated version to "0.2.0" and included the `validate_params` decorator from `flask_utils.decorators`.
`flask_utils/decorators.py`	Introduced the `validate_params` decorator and helper functions for parameter type checking.
`tests/test_validate_params.py`	Added test cases for the `validate_params` decorator covering various scenarios and parameter types.

Sequence Diagram(s)

sequenceDiagram
    participant Client
    participant FlaskApp
    participant validate_params
    participant UserService

    Client->>FlaskApp: POST /create-user
    FlaskApp->>validate_params: Validate request parameters
    validate_params-->>FlaskApp: Parameters valid/invalid
    alt Valid Parameters
        FlaskApp->>UserService: Create user with parameters
        UserService-->>FlaskApp: User created
        FlaskApp-->>Client: 200 OK
    else Invalid Parameters
        FlaskApp-->>Client: 400 Bad Request
    end

Poem

In the world of Flask, a route anew,
With validate_params, our checks grew.
User creation now pristine and bright,
Errors caught, everything just right.
Tests abound to keep code tight,
In this update, we find delight.
🐇✨

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Seluj78 / flask-utils