Sigllm

Internal improvements and removing support for Python 3.8

* Add entrypoints for mlblocks – [Issue 32](https://github.com/sintel-dev/sigllm/issues/32) by sarahmish
* Make readme.yml use Python 3.10 – [Issue 30](https://github.com/sintel-dev/sigllm/issues/30) by sarahmish
* Migrate from setup.py to pyroject.toml to specify project metadata – [Issue 28](https://github.com/sintel-dev/sigllm/issues/28) by sarahmish

New Prompter pipeline.

* Test README with GPT – [Issue 20](https://github.com/sintel-dev/sigllm/issues/20) by sarahmish
* Mistral-prompter – [Issue 19](https://github.com/sintel-dev/sigllm/issues/19) by Linh-nk

First sigllm release to PyPI: https://pypi.org/project/sigllm/

* Add README – [Issue 17](https://github.com/sintel-dev/sigllm/issues/17) by sarahmish
* Create a SigLLM API – [Issue 13](https://github.com/sintel-dev/sigllm/issues/13) by sarahmish
* Add a Quick Example – [Issue 12](https://github.com/sintel-dev/sigllm/issues/12) by sarahmish
* Forecasting Pipeline – [Issue 11](https://github.com/sintel-dev/sigllm/issues/11) by sarahmish
* Refactor Transformation Primitives – [Issue 7](https://github.com/sintel-dev/sigllm/issues/7) by sarahmish
* Forecasting Module – [Issue 2](https://github.com/sintel-dev/sigllm/issues/2) by sarahmish