Added RefreshTotalLiquidStaked (for upgrade handler)

[sampocs]

Context

In the upgrade handler that onboards LSM, we'll have to bootstrap the total liquid staked tokens and shares. This PR introduces a function RefreshTotalLiquidStakedTokensAndShares that can be called from the upgrade handler, or any time the global cap is re-enabled.

Changelog

• Added RefreshTotalLiquidStakedTokensAndShares that:
  • Resets each validator's TotalLiquidShares to 0
  • Iterates delegation records owned by module accounts
  • Updates each validator's TotalLiquidShares as well as the global TotalLiquidStakedTokens
• Added corresponding unit tests

[faddat]

oh-oh, this was merged into your global cap branch @sampocs -- hope that is okay... my review order will be poor on this one

[sampocs]

@sampocs that's fine! I'll let you know when the others are ready for merge. Would be nice to hold off until we get some reviews