Add staking using permit, allow staking on behalf using helpers, implement claim and restake functionality

[The-3D]

On top of StakedTokenV3 which implements the slashing functionalities, the following are needed:

• ability to stake using permit
• implement a claimRewardsOnBehalf() that allows whitelisted helper contracts to claim on behalf of a user. This will be used to implement claiming across all the possible stake tokens in the safety module
• implement a claim and restake functionality to allow easy compounding without requiring two transactions