Added a custom loader for .txt files

[casanova1510]

This PR introduces a custom text loader for .txt files. The text_loader.py script is designed to read and print the content of .txt files, providing a versatile solution for handling text-based data sources.

This loader is a valuable addition to the project, enabling support for text data sources and expanding the project's data loading capabilities.

Changes Made:

Added text_loader.py to the project.
Implemented the load_text_file function for loading .txt files.
Created a test script, test_text_loader.py, to demonstrate the functionality.

[sam-aiplanet]

Hi , Can you please create a component based implementation like we have done for other modules . You can take reference from this file on how to create a simple component that can be used in a stack . Thank you