Merge pull request #163 from sensein/github-wf

- re-organized unit tests adding SKIP based on GPU (cuda) availability
- integrated self-hosted runner for testing with GPU
- temporarily removed support for python 3.12 (following harsha's suggestion - apparently there is an existing issue with python 3.12 and pytorch)
- removed tests on macos with x64 architecture
- parallelized pytests on multiple cpus
- removed testmon
- removed pytest from pre-commit hooks
- temporarily commented out the transcribe_timestamp workflow because it fail all tests on the GPU
- fixed an embedding_extraction bug on GPU
- enabled caching and authentication when checking whether a github exists
- fixed a plotting bug
- fixed tutorial naming