v1.0.115

Add DeepMind FGN Model (#154)

* Add README for model overview

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* Add basic overall FGN model class

* Copy over more from GenCast implementation

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* Copy in GenCast code, modified for FGN

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* Add tests

Currently fails, but needs to work

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* Model works

* Update to FGN model size defaults

* Update prediction response

* Remove sin/cos day of year bit

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Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>