HOWTO: Run a validator with Horcrux KMS

[kioqq]

Describe the process of running the validator using the Horcrux KMS cluster or how to migrate to Horcrux.

links:
guide as ref: https://hackmd.io/@rlAQDfuASVipd24WV04u_g/ByYEry9P2
repo: https://github.com/strangelove-ventures/horcrux
migration guide: https://github.com/strangelove-ventures/horcrux/blob/main/docs/migrating.md