[CL]: Reimplement freezing for migrated positions

[czarcas7ic]

Background

When migrating a position from balancer to CL, a user that was SFS should be frozen in place for whatever remaining time that user had on their balancer lock. This is to allow a retroactive slash in the even their SFS got slashed during migration

Migrating should only be a temporary message that eventually gets removed. We should add a gov feature that enables and disables migrating for specific pools.

We really need to consider what this retroactive slash would even look like. Imagine a user with 1 min freeze left gets slashed and then IBCs out. We couldn't slash this individual. It feels like there needs to be some hook in place that freezes the position indef in the event their migrated position would have been slashed.

Additionally, the above retroactive slashing should be explicitly approved by governance before being added to the upgrade.

Suggested Design

• Implement freeze logic
• Implement gov messages

Acceptance Criteria

• Tests added
• Have an answer for retroactive slashing design

[czarcas7ic]

All 5 PRs merged!