Phase 1 for dashboard: skeleton api server and defining data types to be sent

[kushagra0902]

Description

Phase 1 for making a dashboard to show key KPI's related to relays. In this phase, data types for metrics sharing, endpoints for them making server for KPIs and tests for measuring these steps are added.

Related Issue

This is related to issue #144

Motivation and Context

The main motivation is discussed in the issue thread. TLDR: Making a dashboard so that users can keep track of relay performances against different configs.

How Has This Been Tested?

Unit tests that are used are added. Along with them manual testing using a local spun server and hitting end points have been used.

Screenshots (if appropriate):

N/A

Types of changes

• Non-functional change (docs, style, minor refactor)
• Bug fix (non-breaking change which fixes an issue)
• [x ] New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• [ x] My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• [ x] I have read the CONTRIBUTING document.
• [x ] I have added tests to cover my code changes.
• [ x] All new and existing tests passed.