add algorithms to detect cycle in graph

[Zzocker]

Description

Add algorithms to detect cycles in directed and undirected graphs using both bfs and dfs traversal

Type of change

• [x] New feature (add algorithms to detect cycle in graph)

Checklist:

• [x] I ran bellow commands using the latest version of rust nightly.
• [x] I ran cargo clippy --all -- -D warnings just before my last commit and fixed any issue that was found.
• [x] I ran cargo fmt just before my last commit.
• [x] I ran cargo test just before my last commit and all tests passed.
• [x] I added my algorithm to the corresponding mod.rs file within its own folder, and in any parent folder(s).
• [x] I added my algorithm to DIRECTORY.md with the correct link.
• [x] I checked COUNTRIBUTING.md and my code follows its guidelines.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 94.85%. Comparing base (87673f0) to head (0f7c196). Report is 1 commits behind head on master.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #721 +/- ## ========================================== + Coverage 94.80% 94.85% +0.05% ========================================== Files 301 302 +1 Lines 22356 22575 +219 ========================================== + Hits 21195 21414 +219 Misses 1161 1161 ```

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