Add Distributed Partition Function (DPF) example notebook

[sfc-gh-mcoolsaet]

Summary

• Adds an end-to-end example notebook demonstrating DPF for parallel data processing across compute pool nodes
• Covers DataFrame mode (partition by column), Stage mode (partition by file), and ML Jobs deployment via @remote
• Uses a supply chain allocation scenario (linear programming with scipy) as the example workload

[sfc-gh-mcoolsaet]

@sfc-gh-shchen Can you review?