Add snorkel.labeling.filter_unlabeled_rdd utility

[rjurney]

Is your feature request related to a problem? Please describe.

I love snorkel.labeling.filter_unlabeled_dataframe(). I want a pyspark equivalent: snorkel.labeling.filter_unlabeled_spark_rdd or snorkel.labeling.filter_unlabeled_spark_dataframe.

Describe the solution you'd like

Implement the same filtering for pyspark.sql.DataFrames or pyspark.RDDs.

Describe alternatives you've considered

I am just implementing this myself at the moment. I don't see an alternative to this function.

Additional context

The numpy.ndarray in for example L_train returned by SparkLFApplier may have to be serialized into something else so Spark can use it. SparkLFApplier could then optionally return this format, if it makes that easier.

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