fix: correct treap split() comparison to match docstring behavior

[maitriupadhyay03-cell]

Describe your change:

The split() function in data_structures/binary_tree/treap.py uses a strict < comparison, but the docstring states:

Left tree contains all values less than split value.
Right tree contains all values greater or equal, than split value

This means when splitting by a value that already exists in the treap, the existing node ends up in the LEFT subtree instead of the RIGHT subtree, which contradicts the documented behavior.

Fix: Changed elif value < root.value: to elif value <= root.value: so that equal values go to the right subtree as documented.

Fixes #7854

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