feat: Allow Node Operators to Self Register Validators

[vvalecha519]

Note

Split validator onboarding into register-then-create phases with new roles, status tracking, and invalidation support.

• Staking Flow (two-phase):
  • Add pre-registration step stakingManager.registerBeaconValidators(...) and require status before creation.
  • New LiquidityPool.batchCreateBeaconValidators(...) sends 1 ETH per validator; gated by LIQUIDITY_POOL_VALIDATOR_CREATOR_ROLE.
• Roles:
  • LiquidityPool: add LIQUIDITY_POOL_VALIDATOR_CREATOR_ROLE.
  • StakingManager: add STAKING_MANAGER_VALIDATOR_INVALIDATOR_ROLE.
• StakingManager:
  • Track validatorCreationStatus with ValidatorCreationStatus enum and ValidatorCreationStatusUpdated event.
  • New registerBeaconValidators(...) (validates bids, roots, node) -> sets REGISTERED.
  • Update createBeaconValidators(...) to require REGISTERED, set CONFIRMED, and emit status updates.
  • New invalidateRegisteredBeaconValidator(...) to mark INVALIDATED.
• Interfaces:
  • ILiquidityPool: add batchCreateBeaconValidators(...).
  • IStakingManager: add enum, registerBeaconValidators(...), invalidateRegisteredBeaconValidator(...), event, and InvalidValidatorCreationStatus error.

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