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BREAKING CHANGE: embedding function implementations in Node need to now call `resolveVariables()` in their constructors and should **not** implement `toJSON()`. This tries to address the handling of secrets. In Node, they are currently lost. In Python, they are currently leaked into the table schema metadata. This PR introduces an in-memory variable store on the function registry. It also allows embedding function definitions to label certain config values as "sensitive", and the preprocessing logic will raise an error if users try to pass in hard-coded values. Closes #2110 Closes #521 --------- Co-authored-by: Weston Pace <weston.pace@gmail.com>