issue/scenario testing for metaVaults

[tushargargght]

Finding and implementing missing scenarios/tests for integration

Missing Scenarios

• add _afterRemoveVault hook to SameAssetsUnderlyingAVbstractVault #68
• update assetsPerShare in _afterAddVault hook for PeriodicAllocationAbstractVault
• Create behavior for PerfFeesAbstractVault
• PerdiodicAllocationPerfFeesMetaVault update assetsPerShare in following
  • after Rebalance
  • after settle
  • after charge Performmance fees
  • after removeVault
• use PerfFeeAbstractVault behavior in PerdiodicAllocationPerfFeesMetaVault

Scenario analysis remaining for Convex3CrvLiquidatorVault

[tushargargght]

As discussed, will implement #68 and park this issue for now.