simon/simple swift tokenizer tests

[AdonisCodes]

Reason

Testing via "Feels-based" testing is effective very early in a projects development, but this doesn't work at scale where the smallest of change can topple a system. Considering the previous sentence we need to implement some way of testing our code effectively with every new addition!

Tech Details List

• Implements a couple test-cases to ensure all is covered by the current Tokenizer Implementation
• Implements the GetAutomaApp/opensource-actions/swifttesting action to run tests

Tasks:

• Ensure all tests for the tokenizer are exhaustive (try to catch all edge cases)

Links:

ISSUE-7
closes/resolves #7

Testing

• Ensure Specs pass (GHA)