API to Validate Auth Tokens

### Problem Statement

Feedback from a customer:

> Please add a validate API to validate / verify if the API Auth Token is correct or not.
> 
> For example:
> 
> /validate?auth=sntry_xxxxxxxxxxxxxxxxxxxxxxxxxxx
> 
> Returns:
> 
> is_valid = [true | false]

### Solution Brainstorm

_No response_

### Product Area

APIs