Issue-58: Remove duckdb filtering

Type of change

• Bug Fix
• Feature

Does this introduce a change in the core logic?

• [Yes]

Does this introduce a change in the cloud provider implementation, and if so which cloud?

• AWS
• Azure
• GCP
• IBM

Does this introduce a change that must be documented in the README.md file?

• [Yes] The readme on tutorial has been updated with available aggregation functions

Updates description?

• Remove duckdb and its uses (dataframe filtering)
• Add pandas dataframe filtering (selection, projection, aggregation), maintaining as much as possible same behavior
• Cover with tests
• Closes #58 (closed)