Add query cache feature and endpoint to invalidate cache

Implement follow: https://hasura.io/docs/latest/caching/overview/
To clear cache use these endpoint:
POST /public/pro/cache/clear?key={HASH} -- Clears key hash
POST /public/pro/cache/clear?family={FAMILY} -- Clears items that match query family (ignoring variables)
DO NOT SUPPORT Clear All 
(Ref: https://hasura.io/docs/2.0/caching/caching-config/#clearing-items-from-the-cache)
