[Feature]: make val privkey modular #21587
Description
Summary
Comet rc2 contains api breaks from rc1. In this pr #21586 i hardcode privkeys to ed22519 but we should make this modular allowing the application developer to pass in the key they desire.
Problem Definition
No response
Proposed Feature
Allow the application developer from baseapp and/or serverv2 to pass in a validator key that will be used in order to start the node