V2: Endpoint changes as per the REST API Guidelines

[GauravWalia19]

Endpoint Changes

1. api/v1/randomCodes >> api/v2/code/random
2. /api/v1/rateCode >> /api/v2/code/rate
3. /api/v1/searchUser >> /api/v2/user/search

Other Changes

• /api/v2/code/rate should be PATCH instead of PUT
• codemash website has to be updated