feat: Add `HasPerformanceTracker` mixin on `Game`

[ufrshubham]

Description

This PR adds a HasPerformanceTracker mixin on Game. This mixin will allow for tracking the update and render time of the game.

Checklist

• [x] I have followed the Contributor Guide when preparing my PR.
• [x] I have updated/added tests for ALL new/updated/fixed functionality.
• [x] I have updated/added relevant documentation in docs and added dartdoc comments with ///.
• [x] I have updated/added relevant examples in examples or docs.

Breaking Change?

• [ ] Yes, this PR is a breaking change.
• [x] No, this PR is not a breaking change.

Related Issues

NA