Desolver

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* Fully ported backend to use autoray instead of manual specification of each backend, this enables a more portable setup
* Fully removed pyaudi as a backend

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* Updated to `pyproject.toml` setup and removed `pyaudi` support.
* Added changelog to repository
* Moved to pyproject.toml and hatch build system
* Updated github workflow to use hatch
* Reconfigured tests to have skip flags and have tests enabled by default

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* Improved performance of implicit methods, added embedded implicit methods following Kroulíková (2017) for fully implicit adaptive integration.

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* Initial release of implicit integration schemes that use a basic newton-raphson algorithm to solve for the intermediate states.

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* PyAudi support has been finalised. It is now possible to do numerical integrations using ``gdual`` variables such as ``gdual_double``\ , ``gdual_vdouble`` and ``gdual_real128`` (only on select platforms, refer to `pyaudi docs <https://darioizzo.github.io/audi/>`_ for more information). Install desolver with pyaudi support using ``pip install desolver[pyaudi]``. Documentation has also been added and is available at `desolver docs <https://desolver.readthedocs.io/>`_.

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* Event detection has been added to the module. It is now possible to do numerical integration with terminal and non-terminal events.