Change ping endpoint for validating api key

[deshraj]

Description

Current endpoint creates a GET_ALL event in the Mem0 Platform. Hence, changing the route to ping endpoint so that it just validates the API key and doesn't do anything else.

Type of change

• Bug fix (non-breaking change which fixes an issue)

How Has This Been Tested?

Tested manually and works fine.

import requests
r = requests.get("https://api.mem0.ai/v1/ping/", headers={"Authorization": "Token m0-xxx"})
r.raise_for_status()