Add functionality of finding the most dominant eigenvector and eigenvalue for the given matrix

You have to use the power iteration method to find the most dominant eigenvector. [here](https://en.wikipedia.org/wiki/Power_iteration) is the Wikipedia link to the algorithm

The issue names no file, test, input format, or entry point. Start by inspecting the repository for its C++ structure and any matrix-related code, then read the linked Power iteration article; done means the project finds the dominant eigenvector and eigenvalue for a given matrix.

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