feat: binarytree

[Vaibhav0527]

Description

This pull request introduces a new feature that allows users to generate any custom Binary Tree structure /binary search tree by entering node values in level order, using -1 to indicate missing (null) children.

Key updates include:

Added Level Order Tree Builder function that constructs a tree based on an input array (e.g., [1, 2, 3, 4, -1, -1, 5]).

Updated UI input section for users to enter level order values.

Integrated "Build Tree" button to instantly create and visualize the specified tree.

Improved visualization logic to correctly handle skipped nodes (-1).

Optional manual Add Left / Add Right functionality for interactive tree building.

Semver Changes

• Patch (bug fix, no new features)
• Minor (new features, no breaking changes)
• Major (breaking changes)

Issues

List any issues that this pull request closes.

Checklist

• I have read the Contributing Guidelines.