Ft/Swahili language support

[m453h]

This PR introduces support for the Swahili language, enabling the following features:

1. Sentence Parsing: Breaks each story into individual sentences, which are then stored in the story_sentences table.
2. Text Processing: Includes tokenization, stemming, and stop word removal, which are utilized for word counting, providing data for various word-counting API endpoints.

Addresses: #5

[m453h]

While these changes adheres to the instructions for adding support for a particular language, it will be left in draft until we confirm that everything works as intended