DataFrame for orderBy, limit, and offset

Thanks for @agentm 's opinion, in order to explore more practical usage from relational algebra, we may need

> a new type and processing engine for converting Relations to DataFrames akin to pandas or R DataFrames which do have an ordering.

> Converting to a DataFrame would emphasize the finality of that processing to the user- further relation algebra operators cannot be applied, though the DataFrame could potentially be converted back to a Relation. Normally, this conversion step would be final step in a data retrieval pipeline.

Some reference:
[ACCESSING POSTGRES IN A DATAFRAME IN HASKELL](https://www.gagandeepbhatia.com/blog/accessing-postgres-in-a-dataframe-in-haskell-early-steps-part-1/)