Add Stringify Filter for Jinja2 Rendering

[httpdss]

This pull request introduces a new stringify filter to the Jinja2 templating engine, enhancing the flexibility and cleanliness of variable rendering within templates.

Changes:

• Added stringify filter:
  • Implemented a function that converts strings to lowercase, replaces spaces with hyphens, and removes non-alphanumeric characters.
  • This filter was added to filters.py and integrated into the Jinja2 environment in template_renderer.py.

Justification:

The stringify filter ensures that dynamically generated variable names are formatted in a consistent, URL-safe, and readable way, which is especially useful when rendering template values for deployment configurations.

Impact:

• Allows for better variable handling and formatting in Jinja2 templates, improving the clarity and reliability of dynamically generated content.