[SWIP-15] Prepare StakeWise V2 contracts for the migration to StakeWise V3

The moment has come to open a new chapter for the StakeWise DAO!

In this proposal, we seek your approval to upgrade some StakeWise V2 contracts, pause others, and update the domain name for the existing app to v2.stakewise.io.

This upgrade will support stakers’ ability to move their assets from V2 to V3 in order to benefit from the new functionality available in StakeWise V3, including native unstaking. It will also keep the distribution of rewards in V2 intact to allow users to migrate at their own pace.

Find the full proposal on the forum: https://forum.stakewise.io/t/swip-15-prepare-stakewise-v2-contracts-for-the-migration-to-stakewise-v3/1357