Added cp leaderboard queries and mutations

[AadarshM07]

This adds the necessary queries and mutations required for the cp leaderboard . It includes:

• Schema definitions for leaderboard data
• Structs to represent leaderboard entries
• Mutations to add or update CP handles and unified leaderboard
• Queries to fetch leaderboard information

All functionalities have been tested using the GraphiQL playground

[ivinjabraham]

Your commit messages could use some work; refer https://www.conventionalcommits.org/en/v1.0.0/ and https://www.simplethread.com/what-makes-a-good-git-commit/.

[ivinjabraham]

Rewrite the commits and fix the failing workflow and you're good to go.

[AadarshM07]

@ivinjabraham ok thanks👍