Partial Set Security: Compute the Top N validators and opt them in

[insumity]

Problem

For Top N chains, we automatically opt in validators that are in the top N% of validators according to their voting power. Additionally, if a validator belongs to the the bottom (100 - N)% validators but later enters (e.g., due to delegations) the top N%, this validator is opted in as well.

Closing criteria

1. Top N% validators in Top N chains should be initially opted in.
2. Validator that enters the top N% validator should be opted in.
3. Thoroughly test.

Problem details

We intend to reuse the soft opt-out logic.

[p-offtermatt]

This is done, right? Can we close?