Transpose Array

Problem Statement

Transpose a 2D NumPy array (swap rows and columns).

Background

Transposing swaps rows and columns of a matrix. For an array of shape (m, n), transpose gives shape (n, m).

Your Task

Write a function transpose_array(arr) that:

1. Transposes the input 2D array
2. Returns a dictionary with:
   • "original_shape": Original shape as list
   • "transposed_shape": New shape as list
   • "array": Transposed array as nested list

Output Format

Return a dictionary with exactly these three keys.