[FEA] Support `cudf::replace_nulls` on structs
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feature request
libcudf
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Description
**Is your feature request related to a problem? Please describe.**
I am working on supporting join on StructType in spark-rapids. And I found an unsupported error while testing FullOuterJoin, which caused by `cudf::replace_nulls` on StructType. Here is the [link](https://github.com/rapidsai/cudf/blob/branch-0.20/java/src/main/native/src/TableJni.cpp#L1696) of error code piece.
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