Adding solution ok KMP algorithm

## Fixing Issue #3543

## Description

This pull request adds the implementation of the Knuth-Morris-Pratt (KMP) algorithm in C++ to the DSA folder. The KMP algorithm is used for pattern matching and is efficient in finding occurrences of a pattern within a text. It preprocesses the pattern to create a partial match table, which allows the algorithm to skip unnecessary comparisons, improving the overall search time.

## Type of PR

- [ ] Bug fix
- [x] Feature enhancement
- [ ] Documentation update
- [ ] Security enhancement
- [ ] Other (specify): _______________

## Checklist
- [x] I have performed a self-review of my code.
- [x] I have read and followed the Contribution Guidelines.
- [x] I have tested the changes thoroughly before submitting this pull request.
- [x] I have provided relevant issue numbers, screenshots, and videos after making the changes.
- [x] I have commented my code, particularly in hard-to-understand areas.
- [x] I have followed the code style guidelines of this project.
- [x] I have checked for any existing open issues that my pull request may address.
- [x] I have ensured that my changes do not break any existing functionality.
- [x] Each contributor is allowed to create a maximum of 4 issues per day. This helps us manage and address issues efficiently.
- [x] I have read the resources for guidance listed below.
- [x] I have followed security best practices in my code changes.

## Additional Context

The Knuth-Morris-Pratt (KMP) algorithm implementation includes the following features:
- Preprocessing of the pattern to create a partial match (or "failure") table.
- Efficient pattern searching within a text using the preprocessed table.
- Skipping of unnecessary comparisons, resulting in improved search time compared to naive string matching algorithms.

## Resources for Guidance

Please read the following resources before submitting your contribution:

- [x] [Code Harbor Hub Community Features](https://www.codeharborhub.live/community/features)
- [x] [Markdown Guide](https://www.markdownguide.org/)

Author: sjain1970