[Feat] - Shares Update post OperatorSet/Slashing introduction

[surbhit14]

For Stakers:
shares will become depositShares and withdrawableShares(active) = (depositShares * depositScalingFactor * maxMagnitude)

For Operators:
shares will be sum(withdrawableShares) of all stakers

Steps to cover in this issue

• Add seeder for events OperatorSharesSlashed and DepositScalingFactorUpdated
• Add relevant data tables
• Modify Staker/Operator Schema
• Modify the shares response in API for Staker/Operator routes