Implemented Floyd-Warshall algorithm in the graph module

[ycz1234]

This pull request implements the Floyd-Warshall algorithm in the graph module. The Floyd-Warshall algorithm is used to find the shortest paths between all pairs of vertices in a weighted graph. This implementation provides an efficient way to solve the shortest path problem for all pairs of vertices.

Checklist

• [x] Added description of change
• [x] Added file name matches File name guidelines
• [x] Added documentation so that the program is self-explanatory and educational - Doxygen guidelines
• [x] PR title follows semantic commit guidelines
• [x] Search previous suggestions before making a new one, as yours may be a duplicate.
• [x] I acknowledge that all my contributions will be made under the project's license.

Notes:

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This pull request has been automatically marked as abandoned because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.

[github-actions[bot]]

Please ping one of the maintainers once you commit the changes requested or make improvements on the code. If this is not the case and you need some help, feel free to ask for help in our Gitter channel or our Discord server. Thank you for your contributions!