Make voter-state.json optional

[corverroos]

Problem to Solve

Halo currently auto-generates priv_validator_state.json if it doesn't exist on startup.
Halo however crashes if voter_state.json doesn't exist on startup.

We should align the behaviour and make it easier for operators.

Proposed Solution

Auto-generate voter_state.json if it doesn't exist on startup. Log info level if it was created.

[raehat]

Hey @corverroos, I looked into this issue, seems like voter_state.json already auto-generates if it doesn't exist.

omni/halo/cmd/init.go

Line 329 in 63255d8

} else if err := voter.GenEmptyStateFile(voterStateFile); err != nil {

Do I understand this correctly?

Log info level if it was created.

But yes we don't log info level if it is created.