feat: add FM step with carma and sumstat imputation

[addramir]

✨ Context

Continuation of the series of PR dedicated for fine-mapping wrappers.

🛠 What does this PR implement

This PR adds two functions for the fine-mapping step that has options for CARMA and sumstat imputation.

🙈 Missing

Need to add documentation in the future.

🚦 Before submitting

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