feat: get the sample_rate value from and env variable

feat: changed default sample rate to 24000 for both german and english tts models

feat: add text to speech (TTS)

ci: hugginface space, move from docker to gradio sdk v5.6.0, add missing packages.txt with ffmpeg, pre-requirements.txt with pip, update gradio app to properly format informations to frontend, update tests

feat: use alternate version of init_jit_model to try avoiding PermissionError on HuggingFAce

feat: add dockerfile and save yml silero model within system temp folders to support docker container execution

feat: support pytorch and torchaudio, update test, add requirements-dev.txt

test: update python backend test coverage, remove some unused classes and functions (see README.md)

refactor: organize project with tests in a package, start following suggestions from pycharm, sonarlint and snyk