feat: Add initial spatial join support in Prestissimo using a nested loop join

[wraymo]

Description

This PR introduces basic support for spatial joins in Prestissimo by using the existing nested loop join mechanism. While this approach is simple and ensures correctness, it does not yet include any performance optimizations. It serves as a starting point for enabling spatial joins and will be improved in subsequent iterations.

Motivation and Context

Spatial joins are essential for many geospatial analytics use cases but are currently unsupported in Prestissimo.

Impact

Spatial join will be unlocked.

Test Plan

Verified correctness with Velox.

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Release Notes

Please follow release notes guidelines and fill in the release notes below.

== RELEASE NOTES ==

Prestissimo (Native Execution) Changes
* Add spatial join support