[BUG] Add wrong key argument to example

[Vishwaak]

Describe the bug

It's possible to give a wrong key value to the example module in judgeval

To Reproduce

Steps to reproduce the behavior:
Import the example module from judgeval
pass the wrong key argument to example's constructor function

Expected behavior

example should throw an error saying invalid key.

Environment (please complete the following information):

• SDK Version: 0.0.54

Are you interested to contribute a fix for this bug?

If this is a confirmed bug, the Judgment community is happy to support with guidance and review via Discord.

• Yes
• No

[linear]

JUD-1523 [BUG] Add wrong key argument to example