Feature/issue 576 implement emergency withdrawal in s

[quickweb-stack]

Close: #576

• Staking Contract (contracts/staking/src/lib.rs) : Already had emergency withdraw functionality!
• Liquid Staking Contract (contracts/liquid_staking/src/lib.rs) :
  1. Added Paused to DataKey enum
  2. Initialized Paused to false in initialize function
  3. Added pause() , unpause() , and is_paused() functions (admin-only)
  4. Added _check_not_paused() helper function and updated deposit_rewards() , stake() , unstake() , and claim() to check if paused
  5. Added emergency_withdraw() function that lets users withdraw their stake when paused, without reward updates
  6. Added comprehensive tests for the new functionality!
     All changes are made! The emergency withdrawal feature is now available for both staking and liquid staking contracts!

[quickweb-stack]

Done, Close: #680

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