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Dagster Pandas exists composition and Null event_metadata_fn handling

Description

Dagster Pandas exists composition and Null event_metadata_fn handling

Summary: This revision implements an exists composition for the PandasColumn and also handles the case where people pass None into the constructor for event_metadata_fn.

Test Plan: unit

Reviewers: schrockn, max

Reviewed By: schrockn

Differential Revision: https://dagster.phacility.com/D1971