feat: duplicate message scanner bot

[Simplyalex99]

Description: This pull-request resolves #15 by having a bot delete all duplicate messages except the original channel and send a warning in each channel that lasts about 30 seconds.

To reduce memory consumption, a LRU cache is used and some size restrictions. Currently, Discord has a max of 2000 characters limit per message. The worst case scenario the size of this will be ~2MB; Max size of cache is 100 * max set size 5 storing messages * 2 bytes per character * 2000 max characters from Discord = 2MB. Though this cache last for 30 seconds before clearing again.

Realistically, the average message containing 500 characters would be 500 × 1 KB = ~500 KB for the cache memory consumption.

Also, a test file was created to test the feature and the caching. A dependency, shoehorn, was installed to help with the tests' mockup.

[what-the-diff]

PR Summary

• New Dependency Added

  • A new software package called @total-typescript/shoehorn has been included, introducing more tools that enhance the overall functionality of our project.

• Duplicate Scanner Functionality

  • A new feature known as the Duplicate Scanner has been created. This helps by finding and managing any duplicate messages that a user might send.
  • This scanner comes built-in with a Least Recently Used (LRU) cache, meaning it efficiently keeps hold of a set number of the most recent messages per user.
  • Now, when a user sends a duplicate message, they will be promptly warned, and the message will be deleted automatically.

• Addition of Unit Tests

  • Tests for the duplicate message scanner functionality have been created to ensure everything works as it should.
  • These tests verify that duplicate messages are recognized, and the cache is operating as planned.

• Program Index-Updating

  • The Duplicate Scanner has now been integrated into the main program, enabling it to work in specified channels and contribute to the bot's overall functionality.