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Cache for fetching and storing the table column types.
@spec child_spec(any()) :: Supervisor.child_spec()
@spec fetch_column_types(pid :: pid(), query_id :: binary(), statement :: any()) :: {:ok, map()}
@spec get_column_types(statement :: binary()) :: {:ok, map()} | nil
@spec key_from_statement(statement :: binary()) :: binary()
@spec start_link(any()) :: Supervisor.on_start()