Add g2pw module for text-to-phoneme conversion

## What does this PR do? <!-- Please include a summary of the change and which issue is fixed. Please also include relevant motivation and context. List any dependencies that are required for this change. List all the breaking changes introduced by this pull request. --> Fixes #\<issue_number> ## Before submitting - [ ] Did you make sure **title is self-explanatory** and **the description concisely explains the PR**? - [ ] Did you make sure your **PR does only one thing**, instead of bundling different changes together? - [ ] Did you list all the **breaking changes** introduced by this pull request? - [ ] Did you **test your PR locally** with `pytest` command? - [ ] Did you **run pre-commit hooks** with `pre-commit run -a` command? ## Did you have fun? Make sure you had fun coding 🙃