There are two kind of materialization callbacks: one for target materializations and one for source materializations. The callback type for target materializations is `TargetMaterializationCallbackFn`. This commit renames the one for source materializations from `MaterializationCallbackFn` to `SourceMaterializationCallbackFn`, for consistency. There used to be a single callback type for both kind of materializations, but the materialization function signatures have changed over time. Also clean up a few places in the documentation that still referred to argument materializations.
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