Rcpp interface

[Chandraveersingh1717]

What this does

Adds a C++ implementation for calculating bounding box areas using Rcpp. This is for the GSoC "Rcpp interface" task.

Why

This demonstrates:

• Writing C++ code that works with R
• Using Rcpp to expose C++ functions
• Handling parameters (NumericMatrix input, NumericVector output)
• Input validation and error handling
• Making it work with torch tensors and regular matrices

Usage

# Works with matrices
boxes <- matrix(c(0, 0, 10, 10), nrow = 1)
box_area_cpp(boxes)  # returns 100

# Also works with torch tensors
box_area_fast(torch_tensor(boxes))

[Chandraveersingh1717]

Can you review this PR
Is there something I need to fix or any reason for which it still haven't gotten reviewed ?