Ferric-AI / ferric / 25480776884

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Implement user-proposal importance sampling in the rats example and add tests

- Updated the rats example to utilize user-defined proposal distributions for importance sampling.
- Enhanced the model to include parameters for alpha and beta, with their respective priors and proposal logic.
- Introduced a new `RatsProposer` struct to manage the proposal process, including initialization and proposal generation.
- Added a new test for scalar importance sampling to verify the correctness of user-defined proposals.
- Updated documentation to reflect the new importance sampling capabilities and usage examples.

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