Implement Huber loss function in Machine Learning loss algorithms.

[sozelfist]

Pull Request Template

Description

This PR implement Huber loss function and add to machine learning loss function module.

Type of change

• [x] New feature (non-breaking change which adds functionality)

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

Attention: Patch coverage is 99.30070% with 1 lines in your changes are missing coverage. Please review.

Project coverage is 94.74%. Comparing base (10c986d) to head (b9d4c80). Report is 10 commits behind head on master.

Files	Patch %	Lines
src/machine_learning/loss_function/huber_loss.rs	95.23%	1 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #696 +/- ## ========================================== + Coverage 94.70% 94.74% +0.04% ========================================== Files 292 295 +3 Lines 23292 23494 +202 ========================================== + Hits 22058 22260 +202 Misses 1234 1234 ```

:umbrella: View full report in Codecov by Sentry.
:loudspeaker: Have feedback on the report? Share it here.