FEAT: Add deterministic flag and custom substitutions to LeetspeakConverter

[KutalVolkan]

Description:

This PR introduces two new features to the LeetspeakConverter class in leetspeak_converter.py:

Deterministic Flag:

• Adds an optional deterministic flag to the LeetspeakConverter.
• When enabled, this flag ensures that the conversion from regular text to leetspeak is consistent across multiple runs.
• This is particularly useful in scenarios where reproducibility of the leetspeak output is required.

Custom Substitutions:

• Introduces support for custom leetspeak substitutions, allowing users to specify their own mappings for the conversion process.
• This provides greater flexibility in tailoring the leetspeak output to specific needs or preferences.

Tests:

• Some unit tests are currently failing. These will be addressed by the middle of next week.

Related Issues:

• Issue #242

[KutalVolkan]

Amazing! We probably want to have one test case. Can you add one?

Hello Roman,

Sure! I’ve added the test cases. Please verify them, and all feedback is welcome. I will make any necessary adjustments if needed :)

[rdheekonda]

Great work, @KutalVolkan!

[KutalVolkan]

Great work, @KutalVolkan!

Thank you, @rdheekonda and @romanlutz, for your great support and feedback.