Add powMatrix function (#455)

[shivanjali0108]

Fixes #455

• Added powMatrix function to raise a graph adjacency matrix to a given power.
• Uses binary exponentiation for efficiency.
• Tested locally with small graphs to ensure correctness.

[shivanjali0108]

Tested locally; works correctly on small graphs.

[wrcorcoran]

Open PR with the same, but more general, functionality: https://github.com/ZigRazor/CXXGraph/pull/463/commits

I'm currently extremely busy and haven't had the opportunity to update the CR. Please feel free to combine this CR with yours. Thanks!

[ZigRazor]

yes, please combine the code @shivanjali0108 so we can close the issue

[shivanjali0108]

Hello @ZigRazor and @wrcorcoran, I tried understanding how to merge the code from PR #463 as you suggested, but since I’m still a beginner and new to advanced C++ structure and CMake setup, I found it difficult to complete this correctly. I really appreciate your patience and the learning opportunity. I’ll continue improving and hopefully contribute more confidently in the future.

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