Lazy slasher beacon node

https://ethresear.ch/t/a-lazy-approach-to-slashers/22041

[Discord thread](https://discord.com/channels/593655374469660673/1352244636122353696)

This issue is to track development of a lazy slasher on the beacon node by default that would help with slashings should other slashers fail due to computational overhead as seen on the Holesky incident. This will ensure that in times of heavy network instability, lazy slashers should be able to execute their duties in an effective, resource efficient way.