Added Ranking Losses

[Mayureshd-18]

Closes: #32

• Title : Added Ranking Losses
• Name: Mayuresh
• Idenitfy yourself: GSSOC, SSOC

Describe the add-ons or changes you've made 📃

Added 2 ranking losses, The triplet loss and the Pairwise Ranking loss under rML -> Algorithms -> Losses -> Ranking losses

Type of change ☑️

What sort of change have you made:

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Code style update (formatting, local variables)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

How Has This Been Tested? ⚙️

Tested the losses based on the images dataset to verify the distances supervised and that given by the committed functions.

Checklist: ☑️

• My code follows the Contributing Guidelines & Code of Conduct of this project.
• This PR does not contain plagiarized content.
• I have performed a self-review of my own code.
• I have commented my code, particularly wherever it was hard to understand.
• My changes generate no new warnings.

Screenshots 📷

Note to reviewers 📄

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[Avdhesh-Varshney]

@Mayureshd-18 PR Approved 🎉