refactor: remove GetTotalShares, GetTotalLiquidity and GetExitFee from PoolI

[p0mvn]

Closes: #4787

What is the purpose of the change

This PR refactors PoolI to remove/move APIs that are either incompatible for all pools or must be defined on the pool module instead of a pool struct.

Brief Changelog

• Move poolmanager.PoolI.GetTotalPoolLiquidity to
  • poolmanager.PoolModuleI
  • keep it on gammtypes.CFMMPoolI as well
• Remove/move from poolmanager.GetExitFee to gammtypes.CFMMPoolI
  • ref: remove exit fee param #4440 as no future pool will have an exit fee. We will continue having it on CFMMPools
• Remove/move poolmanager.GetTotalShares to gammtypes.CFMMPoolI
  • Don't have a concept of shares on CL pool.
• Implement GetTotalPoolLiquidity on gamm keeper
• Implement and test GetTotalPoolLiquidity on CL keeper
• Pass through helper function renames and exports where required.

Testing and Verifying

Added tests and covered by existing

Documentation and Release Note

• Does this pull request introduce a new feature or user-facing behavior changes? no
• Is a relevant changelog entry added to the Unreleased section in CHANGELOG.md? no
• How is the feature or change documented? not applicable

[czarcas7ic]

Only minor comments, well done 🙌