HI @ashishk74,
Neither are in the plan for OpenZeppelin Contracts 4.0 currently.
Crowdsales were removed from the 3.0.0 release. They are available in OpenZeppelin Contracts 2.x. See the documentation for details: https://docs.openzeppelin.com/contracts/3.x/crowdsales
For staking, I suggest adding to the discussion: Studying the building blocks of DeFi.