feat: Update dataframe_operations.py

[Empreiteiro]

Adding the "Convert to Data List" and "Base64" functions to the DataFrame Operations component.

Use Cases:

Convert to Data List: Useful function to transform a dataframe into a datalist, preparing the data to pass through a loop or other component that does not accept dataframes.

Base64: Transforms the dataframe into a string in base64 format, allowing you to share the dataframe in image format within the Playground and/or any other connected application, including Google Drive, Slack, among others.